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Fen Howe

09 March 2026

In Defense of Hard-Side Luggage

In a recent blog, one of our team members made a thoughtful case for soft-side luggage, highlighting flexibility, expandability and lighter weight. Those are valid points. But there’s another side to this debate and it comes from firsthand experience on the front lines of air travel.

Here’s Travel Sentry founder John Vermilye making the case for hard-side luggage.

“I used to load luggage in a ULD, the wedge-shaped aluminium containers that go in the airplane hold, and there are more than 30 bags loaded. A soft-side bag will not do as well as a hard side.”

Inside a Unit Load Device (ULD), your suitcase becomes a Tetris piece. It is tightly stacked alongside dozens of others, subject to pressure, abrasion and contortion. Under those conditions, structure matters.

Hard-shell luggage maintains its shape under compression and is less likely to collapse inward when sandwiched between other bags. A rigid case distributes force more evenly, protecting both the shell and what’s inside.

Soft-side luggage can flex and that flexibility is often marketed as a benefit. But flexibility can also mean less protection for fragile contents. John travels more than most and rarely returns home with just clothes.

“There is no question,” he says, “that a hard-side case provides far more protection.”

If you’ve ever packed gifts, electronics, specialty foods or sports gear, you know how important that added rigidity is. For checked baggage in particular, impact resistance isn’t theoretical, it’s essential.

Aesthetics matter as well. Today, luggage is part of the overall travel look as much as it is a practical purchase. Hard-shell cases have grown in popularity not only for their durability, but for their clean, structured appearance and modern finishes. Hard-shell luggage is also straightforward to look after as a solid shell can usually be wiped clean with a damp cloth after a trip.

Wet. Wet. Wet.

Bags are transferred across open tarmac, loaded in changing conditions and exposed to the elements far more than most travelers realize. You drop your suitcase at check-in and don’t think about it again until it arrives at the carousel, potentially half the world away.

As John explains:

“I watched the summer rainstorms sweep across the airport in Miami every afternoon, knowing full well that we would get claims for wet luggage contents from the soft bags.”

Heavy rain, sudden storms and high humidity are realities in many parts of the world. While soft-side luggage can be made with treated fabrics or water-resistant coatings, fabric panels and stitched seams are inherently more vulnerable to water ingress than a solid shell.

Another consideration’s often overlooked: tropical climates. In regions with persistent humidity, moisture absorbed into fabric luggage can linger, especially if bags are stored without full drying. Over time, this increases the propensity for mold and mildew to develop inside soft-side cases. Hard-shell luggage, by contrast, does not absorb moisture in the same way, making it easier to wipe dry and maintain.

A well-constructed hard-side suitcase, particularly one with tight seals, offers an additional barrier between your belongings and the elements. For travelers carrying business clothing, important documents or electronics, that added protection can make all the difference.

Frame vs. Zipper: A Side Note Worth Considering

Even within the hard-side category, John notes an important distinction:

“Side note: for myself, I always choose frame cases rather than zipper cases for two reasons: security and water resistance.”

Frame cases eliminate the potential weak point of a zipper. While modern zippers are strong, they can be forced or split under pressure. A framed closure system adds rigidity and typically offers a tighter seal, improving both security and resistance to wet conditions.

Add a Travel Sentry-approved lock, and the security equation is complete, allowing bags to be opened and relocked by security authorities without damage.

What Are the Best Materials for Hard-Side Luggage?

Not all hard-shell luggage is created equal. The material determines durability, weight and performance.

Polycarbonate (PC)

Widely regarded as the premier choice. Strong, flexible and lightweight, polycarbonate can absorb impact without cracking which is ideal for frequent flyers.

Polypropylene (PP)

Extremely lightweight and durable, with excellent flexibility and impact resistance.

Aluminium

Highly durable and secure, offering maximum protection. Heavier and typically positioned at the premium end of the market.

ABS (Acrylonitrile Butadiene Styrene)

A budget-friendly option. Lightweight, but less durable than polycarbonate and more prone to cracking under significant impact.

(You can also explore our full material comparison guide here)

Team Soft or Team Hard?

As with most things in travel, there is no single right answer. Soft-side luggage has its place, particularly for travelers who prioritise expandability and lighter carry-on weight. (You can read our recent article In Praise of Soft-Side Luggage here.)

But from a durability, water resistance and protection standpoint, especially for checked baggage, hard-side luggage offers clear advantages.

If you’re still undecided, our complete guide to choosing luggage breaks down the key features to look for, from materials and closures to locks and mobility systems.

Choosing the Right Hard-Side Suitcase

If you’re thinking about switching to hard-side luggage, choosing the right suitcase can make your travel experience much smoother.

One of the first things to look for is smooth, multi-directional wheels. These make it much easier to move through busy airports, especially when your bag is fully packed. A strong telescopic handle is also important, helping you manoeuvre comfortably through terminals, security lines and crowded boarding areas.

Inside the suitcase, good organisation features can make packing far easier. Many modern hard-shell cases include divider panels, compression straps and zipped compartments that help keep everything in place while your bag is being handled, stacked and moved during transit.

Contact Travel Sentry Today

At Travel Sentry, our goal is to help make air travel simpler, safer and less stressful for travellers around the world.

We work closely with luggage brands, airports and security authorities to support smarter baggage screening. Our TSA locks allow security agencies to open, inspect and relock luggage when required, without damaging the lock or suitcase.

If you’re interested in learning more about Travel Sentry technology, approved luggage locks, or how our solutions support modern airport security, we’d love to hear from you.

Get in touch with the Travel Sentry team today to find out more about our products, partnerships and how we help improve the travel experience for millions of passengers every year.

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March 2026

What Do TSA Scanners See? How Airport Security Scanners Work
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Fen Howe

09 March 2026

What Do TSA Scanners See? How Airport Security Scanners Work

If you’ve ever stepped into an airport body scanner and raised your arms overhead, you’ve probably wondered the same thing millions of travelers ask every day: What do TSA scanners actually see?

Airport security technology has become a routine part of modern travel, yet the machines themselves often remain a mystery. You might imagine security officers viewing detailed body images or assume scanners can see everything inside your clothing or luggage.

The reality is far less dramatic and far more practical.

Airport security scanners are designed with a very specific goal: to detect potential threats quickly while protecting passenger privacy.

They are not designed to examine passengers in detail. Instead, they help security authorities identify unusual objects that could pose a safety risk.

Understanding what TSA scanners see and how TSA scanners work can make the airport security process feel far less mysterious and explain why most passengers pass through screening in just a few seconds.

Why Airports Use TSA Scanners

Airport security systems are designed around one simple principle: Identify potential threats before passengers board an aircraft.

For decades, airports relied primarily on metal detectors. These devices were effective at detecting metallic objects such as guns, knives or tools.

However, modern security concerns require detection of non-metallic threats as well, including plastic explosives, ceramic weapons or composite materials that may not trigger traditional metal detectors.

This is where body scanners became essential.

Body scanners allow security authorities to identify objects concealed under clothing, regardless of the material they are made from.

How Do TSA Scanners Work?

To understand how TSA scanners work, it helps to look at the technology used in modern airport screening systems.

Most major airports today use millimeter wave scanners, a technology that uses extremely low-energy radio waves.

Here’s what happens when a passenger enters the scanner:

  1. The scanner emits harmless millimeter-wave signals.
  2. These waves bounce off the passenger’s body and any objects on it.
  3. Sensors measure how the waves reflect back.
  4. A computer analyzes the reflections and identifies anything unusual.

Different materials reflect radio waves differently. The system compares the reflected signals to the expected shape of the human body.

If something disrupts that pattern, e.g, an object hidden under clothing, the system detects it and flags areas where something unexpected may be present. The entire process takes just a few seconds.

What Do TSA Scanners See?

One of the biggest misconceptions about airport security scanners is that officers see a detailed image of passengers.

This was a concern in the early days of body scanning technology, when some systems generated more detailed outlines.

Today, modern scanners use Automated Target Recognition (ATR) software, which removes the image entirely.

So what do TSA scanners see now?

Instead of displaying the passenger’s body, the system produces:

  • A generic human outline
  • Highlighted areas where the scanner detected something unusual
  • A prompt indicating where additional screening may be required

Security officers see a neutral figure rather than an actual body image. If the scanner detects nothing unusual, the screen simply displays “OK.” The passenger then continues through the checkpoint without further inspection.

Body scanners are designed to detect items such as:

  • Weapons
  • Explosives
  • Plastic or ceramic objects
  • Dense materials hidden under clothing
  • Items taped to the body
  • Tools or sharp objects

The technology focuses on objects that do not match the expected shape or density of the human body.

For example: If a traveler has something hidden inside clothing, attached to the body, or concealed beneath layers of fabric, the scanner will detect the disruption in reflected signals. When this happens, the system highlights the area on the generic figure, so security officers know where to check. A brief manual inspection may then confirm what the scanner detected.

For most travelers, however, the scanner finds nothing unusual, and screening ends immediately.

What TSA Scanners Cannot See

Understanding what TSA scanners cannot see is just as important as understanding what they can detect.

Despite common myths, airport scanners have clear limitations.

TSA body scanners cannot:

  • See inside the human body
  • Show anatomical detail
  • Identify specific personal items
  • Read text or personal data
  • Scan inside luggage
  • Reveal private images of passengers

Security officers are not looking at body images they are looking at a computer-generated alert system. This approach allows airports to maintain effective security screening while addressing passenger privacy concerns.

How Carry-On Bags Are Scanned

While body scanners screen passengers, luggage undergoes a different type of inspection.

Carry-on bags pass through X-ray scanning systems, which work differently from body scanners. Instead of detecting reflected radio waves, X-ray scanners analyze how different materials absorb radiation.

Dense materials, such as metal, absorb more radiation and appear darker on the screen. Less dense materials appear lighter.

This allows trained security operators to identify items inside luggage and determine whether further inspection is necessary.

If something looks unusual or unclear on the screen, a security officer may ask to open the bag.

Find out more about Airport Security.

Why Travel Sentry Approved Locks Matter

Occasionally, airport security authorities may need to inspect checked luggage. When a bag is locked with a traditional lock, officers may have no choice but to cut the lock to access the contents.

Travel Sentry-approved locks were developed to solve this problem.

These locks allow security agencies to open luggage using a secure master key, perform the inspection, and then relock the bag before it continues its journey.

This protects both:

  • The luggage itself
  • The traveler’s belongings

Today, Travel Sentry locks are recognized by 750 airports, helping ensure luggage screening can occur efficiently without unnecessary damage.

For travelers, it provides peace of mind that their suitcase can be inspected without compromising the lock or security of their belongings.

Most passengers today move through security checkpoints in under a minute.

Combined with X-ray systems for luggage and technologies like Travel Sentry-approved locks, modern airport screening helps maintain the balance between security, efficiency and traveler privacy.

And for most passengers, the process is over almost as quickly as it begins.

Contact Travel Sentry Today

Airport security can sometimes feel confusing, especially with new technology like body scanners and advanced screening systems. Understanding how the process works can make travelling much smoother and less stressful.

At Travel Sentry, we’re committed to helping travellers move through airports with greater confidence. Our globally recognised TSA locks allow security agencies to inspect luggage safely when required, without damaging your lock or suitcase.

If you have questions about airport security, Travel Sentry Approved locks, or how our solutions support safer travel around the world, we’d be happy to help.

Contact us today.

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March 2026

In Defense of Hard-Side Luggage
Read More
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Samsonite Respark case with TSA lock

Molly Gibson

Marketing Manager

Molly has 3 years of experience at Travel Sentry and in-depth experience researching travel and luggage related topics.

25 February 2026

The Space Under Your Seat: Why Under-Seat Luggage Is Changing 

Last year, we noticed a significant increase in under-seat cabin baggage options as airlines began enforcing cabin baggage rules more strictly. 

In some cases, travellers are allowed only an under-seat personal item, unless they pay to upgrade their fare. 

What started as a basic, entry-level category is quickly evolving. 

More under-seat bags on sale today include Travel Sentry-approved locks as standard, reflecting how traveller expectations have changed. 

What Are Travellers Putting Under the Seat? 

Travel Sentry’s 2025 consumer research showed that the items travellers most often lock are: 

  • Phones and laptops 
  • Cameras 
  • Travel documents 
  • Jewellery 
  • Medication 

If those items aren’t in the overhead compartment, they’re either on you or under the seat in front of you, which naturally increases demand for secure, lockable under-seat luggage. 

Why Add a TSA Lock to an Under-Seat Bag? 

Originally, TSA locks were marketed for checked luggage, allowing airport security to inspect bags without damaging them. 

So why are we now seeing them on carry-on and under-seat luggage? 

Because travellers don’t make a huge distinction between checked and cabin luggage when it comes to security. What they recognise is that a Travel Sentry Approved lock is airport-approved and globally recognised. 

The red diamond symbol signals that: 

  • The lock is compatible with airport security 
  • It’s designed specifically for travel 
  • It’s a secure and trusted option 

Even inside the cabin, a lock can provide peace of mind. After all, everyone leaves their seat at some point during a flight or might be seated away from friends or family who would typically keep an eye on belongings.  

And sometimes carry-on bags are unexpectedly gate-checked when overhead bins are full. Better for your carry-on bag to be locked just in case. 

IT Luggage - Convertible - Underseat Luggage

Why Under-Seat Bags Matter More on Basic Fares 

Travellers continue to fly frequently, but many are choosing: 

  • Low-cost airlines 
  • Basic economy fares 
  • No checked baggage 

That means everything for the trip may need to fit under the seat. 

When your essentials are stored in one small bag, features like durability, organisation, aesthetics and security matter more than ever. 

Under-seat luggage is no longer just a secondary bag. For many travellers, it’s the only bag. 

What Features Should You Look for in an Under-Seat Bag? 

If your under-seat bag is your primary luggage, look for: 

Dimensions that meet airline limits (check cm and inches) 
Clear capacity in litres 
Lightweight but robust construction 
Compact, smooth-rolling wheels 
External compartments for easy access 
Compression straps to maximise space 
A Travel Sentry-approved lock 

Cabin Max Luggage

How to Maximise Packing in an Under-Seat Bag 

Small space requires smart packing. 

Try these tips: 

  • Wear your bulkiest shoes and outerwear 
  • Roll clothes instead of folding 
  • Use packing cubes 
  • Fill every available gap 
  • Keep electronics and liquids accessible for security screening 

Not every airport allows laptops and toiletries to remain in your bag during screening. Easy access can help you move through security faster. 

The Real-World Separation Scenario 

Even if you plan to carry your bag onboard, situations change: 

  • Overhead bins fill up 
  • Aircraft change 
  • Boarding restrictions apply 

In those moments, a carry-on can quickly become checked baggage. 

While overhead space can disappear, the space under the seat in front of you is almost always available. 

FAQs: Under-Seat Luggage & Personal Item Rules 

Which airlines only allow an under-seat bag on basic fares? 

Airline rules change frequently, but stricter enforcement is commonly reported from: 

Europe 

  • Ryanair 
  • Wizz Air 
  • Norwegian 
  • Volotea 
  • EasyJet (basic fare includes under-seat item only) 

United States 

  • Frontier 
  • Spirit 
  • United (basic economy) 

Always check your airline’s current baggage rules before travelling. 

You can also use our Carry OK tool to compare airline size limits. 

What size should an under-seat bag be? 

Under-seat bag size limits vary by airline. Many personal item allowances are smaller than standard carry-on dimensions. 

Always measure your bag including wheels and handles and compare it against your airline’s published limits before flying. 

Can an under-seat bag be gate-checked? 

Yes. Even if your ticket includes an under-seat item only, operational changes or aircraft swaps may require bags to be gate-checked at the airline or airport staff’s discretion.  

Choosing a bag with a secure, Travel Sentry-approved lock can help protect your belongings if that happens. 

Is it worth locking a carry-on or personal item bag? 

Yes, especially if you carry valuables such as electronics, travel documents or medication. 

A Travel Sentry-approved lock allows airport security to inspect your bag without damage if required, while also helping deter opportunistic theft. 

What is the difference between a personal item and a carry-on bag? 

A carry-on bag typically fits in the overhead compartment. 

A personal item (or under-seat bag) must fit under the seat in front of you and is often the only bag included in basic economy fares. 

Related Articles

February 2026

In Praise of Soft Side Luggage

Is soft sided luggage a better choice than hard-shell luggage?  

Read More

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Airline Carry-On Rules Explained: Liquids, Restrictions & What to Expect

A practical guide to help travellers avoid delays by checking bag size before they fly.

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How to Keep Your Luggage Safe while Travelling

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Read More
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Clara Wooller

Chief Marketing Officer

Clara joined Travel Sentry in 2024 as CMO. She brings a passion for cold places, trend spotting and always has her eye on her next trip.

18 February 2026

In Praise of Soft Side Luggage

Everyone has their personal preference when it comes to luggage – for me, I’m a die-hard soft side luggage fan. Beyond the fact that it’s generally lighter than hard shell luggage, as a committed over-packer and occasional souvenir shopper, I like the fact that you’re less constrained by a rigid shell and you can absolutely STUFF stuff in – while testing your zippers and straps to the max. Previously, a TSA padlock was the last port of resistance to prevent your soft side luggage opening under strain, but now I’m happy to report that soft side luggage has more options, which make it a realistic alternative to the often more aesthetic and solid hard shell pieces.  

What are the best materials for soft side luggage?  

Ballistic nylon – Originally developed for military use, this is one of the most durable options available. It’s highly resistant to tears, abrasions, and punctures. 

Cordura nylon – Another military-grade fabric that’s exceptionally tough and abrasion-resistant. It’s lighter than ballistic nylon but still extremely durable. 

Polyester (high-denier) - When woven at high thread counts (1200D or higher), polyester jacquard becomes very durable and resistant to wear. It’s also more affordable than nylon options while still offering good protection. 

Ripstop nylon - Features a reinforced weave pattern that prevents tears from spreading, making it particularly good at resisting rips and punctures. 

Polycarbonate-coated fabrics - Some manufacturers add protective coatings to enhance water resistance and durability. 

The “denier” rating (indicated by a number followed by “D”) tells you the fabric’s thickness and weight – higher numbers generally mean more durable material. Look for at least 600D for decent durability, with 1200D or higher being ideal for frequently travelled luggage. 

Is soft sided luggage a better choice than hard-shell luggage?  

It really depends on your priorities and how you travel! For some, the highest possible protection is a must, in which case a hard shell would be the better choice. But for others, a lighter bag that can be easily compressed and stored is a priority, whether that’s at home or in an overhead locker. Soft sided luggage often comes with more external pockets, which can be useful for stowing things you need quick access to on your travels.  

Is soft sided luggage durable?  

If you choose a high-quality soft sided suitcase, they’re usually highly durable – it would take quite a lot of bashing or abrasion to cause any substantial damage to the bag itself or the contents. When shopping for one, the key things to look for are hardwearing fabric, strong zips, and quality wheels that can withstand the rigors of airport handling and various terrain. Another important feature to consider is TSA locks to keep your valuables safe on your travels and allow for damage-free inspection by airport security.  

What are my locking options for soft sided luggage?  

Glad you asked – I’ve already mentioned TSA padlocks as an option, but increasingly, we’re seeing integrated TSA locks on soft sided cases and even backpacks, showing that people value this feature (and it’s easier to not forget to lock when the lock is part of the luggage). Given that backpacks often contain expensive items like laptops, cameras, chargers and medication, it’s a no brainer to lock to deter opportunist thieves.   

Early 2026 soft side standouts

Here are some soft side standouts we spotted recently and what we particularly like: 

Samsonite Splendix  

Elegant leather trimmed details, lots of pockets to keep you organised, lockable front pocket for your laptop and travel documents, a wet pocket and check out the dual lock, a TSA008 – the latest development in lock tech from Travel Sentry.   

Lipault Lost in Berlin  

We appreciate the tasteful colourways with contrasting interior fabrics padded handles, water resistant fabric, foldable interior shelves and an integrated TSA lock with security cabling to lock off zippers making for a case that’s both stylish AND safe.

Kingsons backpacks  

We always admire these integrated TSA lock backpacks when we see them exhibited at the Canton Fair; they are super robust and thoughtfully designed for people who want to protect their tech on the go. It’s a nice surprise to see them available on Amazon, accessibly priced, with numerous features including glasses holders, RFID pockets, anti-theft pockets situated between the dorsal section of the backpack and the wearer’s back. They’re also spacious, extremely lightweight and with waterproof fabric to protect the contents.  

In conclusion, you can benefit from the positives of soft side luggage without having to make security sacrifices! These are just a few of the great soft side products out there which feature integrated TSA locks and we are confident that this subcategory will continue to grow, particularly as airlines get more stringent about reinforcing weight limits. 

Words by Clara Wooller, CMO at Travel Sentry 

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Samsonite Respark case with TSA lock

February 2026

The Space Under Your Seat: Why Under-Seat Luggage Is Changing 

Under-seat luggage gets a security upgrade with Travel Sentry locks.

Read More

January 2026

Airline Carry-On Rules Explained: Liquids, Restrictions & What to Expect

A practical guide to help travellers avoid delays by checking bag size before they fly.

Read More

January 2026

How to Keep Your Luggage Safe while Travelling

We want to share with you how you can prevent theft and loss of items when travelling.

Read More
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Molly Gibson

Marketing Manager

Molly has 3 years of experience at Travel Sentry and in-depth experience researching travel and luggage related topics.

30 January 2026

Airline Carry-On Rules Explained: Liquids, Restrictions & What to Expect

Airline Carry-On Rules Don’t Have to Be Confusing

The boarding gate meltdown, we’ve all seen it. A traveller arrives confident, only to find their carry-on luggage doesn’t meet the airline’s rules, and they’re hit with a last-minute baggage fee. 

Packing for a flight can be tricky because airline carry-on rules vary by airline, airport and country. Along with size, something simple, like liquids, can often cause the most confusion. This article is a practical guide to help travellers avoid delays by checking bag size before they fly, preventing the confiscation of items at security and feeling confident rather than panicking at that stressful last-minute bag check.

Check your bag size against airline carry-on rules with our free CarryOK™ tool

Check your bag size against airline carry-on rules with our free CarryOK™ tool

What Are Airline Carry-On Rules?

Airline carry-on rules vary by airline and ticket type, but generally involve a main cabin bag (to go in the overhead compartment) and a personal item (like a small backpack or purse that fits under the seat), with some airlines applying weight limits. 

Bag Size (Carry-On Dimensions)

Most airlines allow one carry-on bag that fits in the overhead bin, plus a personal item that fits under the seat.

A typical carry-on size example is 22 x 14 x 9 inches (56 x 36 x 23 cm), including wheels and handles.

Personal items are usually smaller, such as a backpack, tote bag, laptop bag or purse.

Size limits vary by airline, especially on low-cost and international carriers.

Not sure if your bag fits? Use our CarryOK™ tool to check airline carry-on size rules.

Is there a weight limit for carry-on bags?

It depends on the airline.

  • Many U.S. airlines do not set a weight limit
  • Many international airlines limit carry-ons to 7–10 kg (15–22 lbs)

If your bag is overweight:

  • Require you to check it
  • Charge an extra fee
  • Gate-check it at boarding

What items are allowed in a carry-on bag?

Most everyday travel essentials are allowed, as long as they meet security rules.

Commonly allowed items include:

  • Clothing and shoes
  • Electronics (phones, laptops, tablets, power banks)
  • Medications and medical devices
  • Travel documents (passport, ID, boarding pass)
  • Liquids under 100 ml / 3.4 oz in a clear bag
  • Snacks and empty water bottles (fill after security)
  • Travel accessories like neck pillows and headphones

Prohibited items include sharp objects, weapons, flammable materials, and liquids over the allowed limit.

Here are some common TSA questions and answers about what you can and can’t pack. 

Carry-on rules help flights board faster and depart on time. Delays occur when bags that won’t fit in overhead bins or under a seat need to be gate-checked. Airline carry-on rules are designed to keep passengers safe, make the best use of cabin space and help flights depart on time.

Don’t be the one to cause the delay! Try CarryOK today!

What Are the Airline Rules for Liquids?

Liquids cause more confusion than almost anything else. Some airports allow liquids to stay in your bag, others require a clear plastic bag, some countries allow larger quantities, and others may confiscate even expensive perfume.

This confusion can lead to stress, delays, and items being thrown away.

So, what are the airline rules for liquids? Most airlines follow airport security regulations, which limit how much liquid you can bring in your carry-on.

Liquids Rules for U.S. Flights

For flights departing U.S. airports, liquids are subject to the TSA 3-1-1 rule:

  • Containers must be 3.4 oz (100 ml) or less
  • All liquids must fit in one clear, quart-size bag
  • One bag per passenger

Items that count as liquids include:

  • Toiletries
  • Gels
  • Creams
  • Pastes
  • Aerosols

Airline Liquids Rules for International Travel

Outside the U.S., liquid rules can vary by country and even by airport.

  • Many UK and EU airports enforce a 100 ml limit
  • Rules may differ depending on airport security scanner technology
  • Duty-free liquids are often allowed if sealed properly
  • Return flights may enforce different or stricter rules

Always check airport security rules, not just airline policies.

What Liquids Are Allowed in Carry-On Bags?

Allowed Under Airline Rules

  • Toiletries under 100 ml
  • Liquid makeup
  • Small gels and creams

Updated 2026 Liquid Rules at Some Airports

In 2026, some airports, particularly in the United Kingdom and Ireland, are changing how liquid restrictions are applied thanks to new 3D computed-tomography (CT) security scanners. These advanced scanners are detailed enough to screen liquids inside your carry-on without you having to unpack them. As a result, a few departures now allow larger containers than the traditional 100 ml limit.

For example, major UK airports like Heathrow, Gatwick, Edinburgh and Birmingham have moved away from the standard 100 ml rule and now permit liquids in containers of up to 2 litres in carry-on baggage, without needing to place them in a clear plastic bag.

Even at airports where the 100 ml rule still applies, the new scanners often mean you don’t have to remove liquids or electronics for screening, which can make getting through security quicker and easier.

Important: These relaxed rules only apply when departing from airports with the new scanners. Other airports around the world continue to enforce the traditional 100 ml liquid rule, so always check the rules at both your departure and return airports before you travel.

Exceptions to the Liquids Rules

  • Baby formula and breast milk
  • Prescription medications
  • Medically necessary liquids (must be declared at screening)

Liquids That Must Go in Checked Bags

  • Full-size toiletries
  • Drinks and large aerosols
  • Alcohol over permitted limits

Common Mistakes Travellers Make with Carry-On Liquids

  • Bringing full-size containers
  • Forgetting that gels and creams count as liquids
  • Packing liquids deep inside the bag
  • Assuming the rules are the same worldwide

Carry-On Bags & Unexpected Gate Checks

Even if you plan to carry your bag onboard, gate checks still happen, especially on full flights or on smaller aircraft.

That’s why:

Learn more about how TSA-accepted locks work

Final Checklist: Airline Carry-On Rules Before You Fly

✔ Check airline size and weight limits
✔ Confirm what the airline’s rules for liquids are
✔ Pack liquids correctly
✔ Prepare for international differences
✔ Lock your bag responsibly

Use CarryOK™to check airline carry-on rules before you travel

Contact Travel Sentry for more Information

If you’re unsure about airline carry-on rules, liquid restrictions, or what to expect at airport security, Travel Sentry is here to help. 

Our resources are designed to make travelling simpler and less stressful, with clear guidance you can trust before you pack. Explore our advice or get in touch to learn more about travelling smarter and with peace of mind.

FAQs: Airline Carry-On Rules & Liquids

What are the airline rules for liquids in carry-on bags?


Liquids are usually limited to containers of 100 ml or less, packed in a clear bag, with exceptions for medical and baby items. These airline carry-on rules are enforced at airport security, so anything over the limit may be confiscated. Checking what are the airline rules for liquids before you travel can help you pack correctly and move through security with less hassle.

Do airline carry-on rules apply everywhere?


No. Rules vary by airport and country, even when flying with the same airline. Local security authorities can apply different standards, which means airline carry-on rules may change depending on where you’re travelling from or through.

Does toothpaste count as a liquid?


Yes. Toothpaste, gels, creams, and aerosols are all treated as liquids. These items must be included within your liquid allowance, so forgetting to pack them correctly can lead to delays or items being removed at security.

How can I check airline carry-on rules before flying?


Use Travel Sentry’s CarryOK™ tool to check carry-on size rules by airline. This makes it easier to confirm airline carry-on rules ahead of time and avoid unexpected issues at the airport, especially when flying internationally.

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Back to all articles

The TS Team

15 January 2026

How to Keep Your Luggage Safe while Travelling

Feeling safe and the safety of your luggage is part of Travel Sentry’s DNA. Every solution we offer is designed to enhance your travel experience and luggage security.

We want to share with you how you can prevent theft and loss of items when travelling. Whether that’s in the airport, at airport security or when you finally make it to your hotel. This is important because you travel with some of the most valuable items in your carry-on, checked luggage, and on your person. 

Here are some steps to stay vigilant and keep your belongings safe.

Keeping Your Luggage Safe When Travelling

We hope these tips to keep your luggage safe will give you peace of mind and improve your travel experience.

Should You Lock Your Luggage?

It is essential to keep your luggage safe when travelling. Some travellers think that they should not lock their hold luggage, as this was previously the advice. However, this was the advice when all bags were being searched pre-flight. The Transportation Security Administration (TSA) now suggests you lock your checked baggage with TSA-approved locks. 

So, in answer to the question, should you lock your luggage? Yes, you can lock your luggage.

Look For the Red Diamond

All Travel Sentry locks are recognised and accepted by the TSA. Look for the red diamond Travel Sentry symbol when shopping for these TSA Locks. The TSA screens approximately 1.4 million checked bags for explosives and other dangerous items daily. Many bags are searched by security agents before being loaded onto the plane. A search can be caused by any small issue picked up at screening.

TSA Accepted Locks

Airport security agents have specialist tools to access the TSA-approved locks and luggage. They can do this efficiently without damage, setting your mind at ease and speeding up the boarding process, a win-win! Other locks and luggage may be broken into during the screening process if a potentially prohibited item is detected. This may damage the luggage and make it an easy target for thieves.

Do not leave luggage unattended

You should always keep your luggage locked and with you when you are at the airport. If luggage is left unattended and unlocked, anyone can open your bag and place prohibited items in it without your knowledge. Once your hold luggage has been checked in, it is out of sight, however, if it has a TSA-accepted luggage lock, you can relax as your luggage is safe.

Track Your Luggage

Travel Sentry offers one step further when it comes to tracking your luggage. We offer an option for you to be able to report lost or stolen luggage with TSID. Our TSID is a smart ID tag with free lifetime protection.

How Does TSID Work?

TSID links owners and their property using a unique code for any item that needs to be protected from accidental loss. By not showing your personal details on your property, your identity and privacy are protected. TSID comes with free lifetime protection with no subscription required. 

You can be as safe and secure as possible, but you cannot control your luggage from going missing. But, TSID is the global solution to track your lost luggage and help find your missing items.

Lock carry-on when flying and travelling

Carry-on luggage should also be secure, as your overhead locker might not be directly above you once you’ve boarded the plane, or in fact anywhere near you! Often, if the plane is busy and hand luggage is overcrowded, your luggage will be stowed in the hold, and without a lock, it is unsafe.

Travelling through an airport

Being in an airport can be extremely busy, stressful, and distracting, so you must always be in control of your bags and belongings. If your carry-on is left open or out of sight even for a few seconds, it will make you an easy target for theft.

Safety in hotel rooms and lockers

No hotel room is 100% secure. Use a security lock when you leave unattended luggage in your hotel room to ensure your luggage is safe while enjoying your vacation. We do advise you to lock your luggage and any valuable items away when you are not in your hotel room to avoid anything from being stolen, and to be cautious, it’s better to be safe than sorry.

Hotel Lockers

A hotel room is never fully secure, even if there’s a safe to lock your valuables. The safe may have a master key that hotel employees can use to gain access to.

We hope these solutions will help you to keep your luggage safe and allow you to enjoy your travel experience. Along with keeping luggage secure, passengers with Travel Sentry luggage locks or padlocks will have a safe, easy and efficient inspection without damaging baggage. Just look for the red diamond Travel Sentry symbol when shopping for these TSA-accepted products.

Protect your peace of mind on every trip

From busy airports to baggage carousels, a little extra protection goes a long way. Choosing a TSA-accepted lock helps keep your belongings secure while allowing airport security to inspect your bag without damaging it. 

Explore how Travel Sentry locks work, why they’re trusted worldwide, and find the right solution to help you travel smarter and with confidence.

Contact our team today for more information.

Luggage Security FAQs

Do TSA locks stop theft entirely?

TSA-accepted locks are designed to reduce the risk of tampering and damage, but no luggage lock can guarantee complete protection against a determined thief. What TSA locks do offer is a smart balance between security and practicality. They help deter opportunistic interference, keep zips closed during transit, and allow airport security to inspect your luggage using authorised tools, without cutting the lock or damaging your bag. For most travellers, this added layer of protection brings valuable peace of mind throughout the journey.

What happens if I use a non-TSA lock?

If your luggage is selected for inspection, and it’s secured with a non-TSA lock, airport security may need to force the lock open to access your bag. In many cases, this means the lock is cut off and cannot be reused, and your luggage may be left unsecured for the rest of its journey. Using a TSA-accepted lock helps avoid unnecessary damage, ensuring your bag can be opened, checked, and relocked properly before continuing to its destination.

Can TSA locks help prevent accidental opening during transit?

Yes, one often overlooked benefit of TSA-accepted locks is that they help prevent bags from accidentally opening while being handled. Luggage goes through multiple stages.

How can I make my luggage more secure alongside a TSA lock?

A TSA-accepted lock works best as part of a broader luggage security approach. Simple steps like choosing a durable suitcase, using identifiable luggage tags, keeping valuables in your carry-on, and securing external zips can all help reduce risk. When combined with a Travel Sentry-approved lock, these measures provide a more complete and reliable way to protect your belongings while travelling.

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