What Can’t You Take on a Plane?

Baggage Rules Explained

Last updated July 2026

  • By Simiran Gataora

Most travellers think airport security and airline baggage rules are the same thing.

They're not.

You might have a bag that passes security perfectly but still gets rejected at the gate because it exceeds your airline's cabin baggage allowance.

Before you fly, it's important to understand both.

 

This guide explains how UK baggage rules work, what airport security checks for, and how airline luggage allowances can affect your journey.

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TL;DR

• Airport security rules and airline baggage rules are different
• Security rules control what you can take onboard
• Airlines control how much luggage you can take
• Liquids are still restricted at most UK airports
• Power banks must travel in hand luggage
• Some items are restricted rather than completely banned
• Cabin bag allowances vary by airline
• Understanding the rules before you pack can save time and money

Table of Contents

1

Airport Security Rules vs Airline Baggage Rules
2

Understanding Hand Luggage, Cabin Luggage and Carry-On Suitcases
3

Understanding Check-In Baggage Rules
4

What Can't You Take Through Airport Security?
5

What Must Go in Hand Luggage?
6

Why Airline Rules Matter Just as Much
7

Common Baggage Mistakes We See Every Day
8

Smart Packing for Easier Travel
9

Final Verdict: What Can't You Take on a Plane?
10

FAQ's

Airport Security Rules vs Airline Baggage Rules

One of the most confusing parts of travelling is that airport security rules and airline baggage rules are not the same thing.

They work together, but they control different parts of your journey.

Airport security rules decide what you can take through security and onto the aircraft. These rules apply to everyone, regardless of who you're flying with.

 

Whether you're travelling with Ryanair, British Airways, easyJet or Jet2, the restrictions on liquids, batteries, sharp objects and other potentially dangerous items are broadly the same.

 

Airport security focuses on:

  • Liquids and gels
  • Power banks and batteries
  • Sharp objects
  • Restricted and prohibited items
  • Screening passengers and baggage

Airline baggage rules are different. They decide how much luggage you can take and whether it meets the airline's size and weight limits.

Airlines control:

This means it's possible to pass airport security with no issues, only to discover your cabin bag is too large for your airline's allowance.

 

For example, a suitcase that meets British Airways cabin baggage rules may not be included with a basic Ryanair fare. Equally, a bag that fits perfectly under an easyJet seat could exceed another airline's personal item allowance.

Case Insight

We see this all the time.

Travellers often spend weeks checking baggage allowances, then get caught out by airport security restrictions on the day they fly. Others focus on security rules and forget to check whether their cabin bag actually meets their airline's size requirements.

The easiest way to avoid problems is to check both before you pack. Airport security decides what goes in your bag. Your airline decides whether the bag can travel with you.
Title

Understanding Hand Luggage, Cabin Luggage and Carry-On Suitcases

Hand luggage, cabin luggage and carry-on suitcases all refer to the same thing: the bags you take onboard the aircraft with you.

The terminology varies between airlines, travel websites, and travellers themselves, which is why baggage rules can sometimes feel confusing before you've even started packing.

In most cases, airlines divide hand luggage into two categories:

Personal Item

A personal item is a smaller bag that fits underneath the seat in front of you.

 

This could include:

  • A handbag
  • A laptop bag
  • A small backpack
  • A tote bag

Many airlines include a personal item as standard, even on their lowest fares.

Cabin Bag or Carry-On Suitcase

A cabin bag is the larger piece of hand luggage stored in the overhead locker.

This is usually a small suitcase, holdall, or travel backpack designed to meet airline cabin baggage limits.

Depending on the airline and fare type, a cabin bag may be included in your ticket or require an additional fee.

Typical UK Cabin Bag Sizes and Weight Limits

While there is no single UK standard for cabin luggage, most airlines fall within similar size and weight ranges.

Cabin Luggage Rule Typical Allowance
Cabin Bag Size Around 55cm x 40cm x 20cm to 56cm x 45cm x 25cm
Personal Item Small bag that fits under the seat in front of you
Cabin Bag Weight Typically between 7kg and 12kg
Storage Location Overhead locker
Personal Item Storage Under the seat in front of you

Even small differences can matter, particularly on low-cost airlines where baggage allowances are often stricter and bags may be measured at the gate.

It's also worth remembering that weight restrictions vary by airline and ticket type. Choosing a lightweight cabin suitcase gives you more of your allowance for clothing, toiletries, and travel essentials rather than the weight of the case itself.

Why Airline Rules Differ

Airport security rules are broadly the same for everyone. Airline baggage allowances are not.

 

Each airline sets its own policies based on aircraft type, available cabin space, fare structure, and route network.

 

That's why a cabin suitcase accepted by one airline may not be included on another airline's lowest fare.

 

Before you travel, it's always worth checking your airline's latest baggage allowance.

For more detailed guidance, see our airline-specific guides:

Case Insight

We often speak to travellers who assume all cabin luggage rules are the same. Then they arrive at the airport and discover their bag isn't included with their ticket or exceeds the airline's size allowance.

 

A quick check before you travel can save unexpected fees and make boarding much smoother.
Title

Understanding Check-In Baggage Rules

While hand luggage travels with you in the cabin, check-in baggage travels in the aircraft hold and is collected from the baggage reclaim area after your flight.

For many travellers, check-in luggage offers more flexibility. You can pack larger toiletries, extra clothing, sports equipment, and other items that may not fit within cabin baggage restrictions.

What Is Check-In Baggage?

Check-in baggage, sometimes called hold luggage, is any suitcase or bag that is handed over to the airline before boarding.

This is typically the best option for:

  • Longer holidays
  • Family trips
  • Winter travel
  • Sports equipment
  • Larger liquids and toiletries
  • Bulky items that won't fit in a cabin bag

Travelling With Sports Equipment

Many airlines allow sports equipment such as golf clubs, skis, snowboards, and bicycles, but these items are often treated differently from standard luggage.

In some cases, you'll need to:

  • Book sports equipment in advance
  • Use a protective travel case
  • Pay an additional handling fee

Always check your airline's policy before arriving at the airport.

Case Insight

We often see travellers focus entirely on hand luggage allowances and leave check-in luggage as an afterthought.

Then the suitcase gets weighed at the airport and unexpected fees appear. A quick check of your airline's baggage allowance and a luggage scale at home can save a lot of frustration before you fly.

Typical Check-In Baggage Allowances

Unlike airport security rules, check-in baggage allowances vary by airline and ticket type.

Weight Limits and Excess Baggage Charges

One of the most common mistakes travellers make is assuming their suitcase can weigh as much as they like.

Most airlines apply strict weight limits to check-in luggage. If your bag exceeds the allowance, you may be charged an excess baggage fee at the airport.

These charges can often be significantly more expensive than pre-booking additional baggage online, so it's worth weighing your suitcase before you travel.

What About Oversized Luggage?

Oversized luggage includes items that exceed an airline's standard size or weight limits.

 

Examples include:

These items may need to be checked in at a dedicated baggage desk and could incur additional charges.
Title

What Can't You Take Through Airport Security?

Airport security rules are designed to keep passengers and aircraft safe. While the exact screening process may vary between airports, the restrictions on certain items are broadly the same across the UK.

The items most commonly stopped at security include:

  • Liquids over 100ml in hand luggage
  • Sharp objects such as knives and large scissors
  • Tools that could be used as a weapon
  • Dangerous goods and hazardous chemicals
  • Flammable items such as fuel, lighter fluid, and fireworks

It's important to remember that some items may be allowed in check-in luggage but not in your hand luggage, while others are prohibited entirely.

Security staff also have the final decision. Even if an item appears harmless, it can still be removed if it is considered a safety risk.

 

For the latest guidance, see the UK Government's hand luggage restrictions page.

 

If you're unsure about a specific restricted and prohibited item, read our detailed guide to Items You Are Not Allowed to Take on a Plane, where we cover liquids, batteries, aerosols, food, electronics, medication, vapes, sharp objects, and other commonly restricted items in more detail.

What About the 100ml Liquid Rule?

The long-standing 100ml liquid rule is beginning to change at some UK airports.

 

Thanks to new 3D security scanners, some airports now allow passengers to carry liquids in containers of up to 2 litres and leave them inside their cabin bags during screening.

 

As of June 2026, airports including Heathrow, Gatwick, Edinburgh, Birmingham, Bristol, Belfast International and Belfast City have introduced the new technology.

However, not every airport has upgraded its security systems, and rules can still vary between departure and return airports.

 

For that reason, many travellers continue to pack liquids according to the traditional 100ml rule to avoid any issues during their journey.

Always check the latest guidance from your departure airport before you travel.  For more on Detailed liquids, food, electronics and 2-litre scanner guidance read our detailed guide to What can I take on a plane? Liquids to foods

Case Insight

Most airport security issues aren't caused by unusual items. They're caused by everyday things travellers forget about, such as a bottle of sun cream over 100ml, a multitool left in a backpack, or a power bank packed in the wrong bag.

 

A quick check before you travel can prevent delays, confiscated items, and unnecessary stress at the airport.
Title

What Must Go in Hand Luggage?

Many travellers focus on what isn't allowed in their hand luggage, but some items create problems because they're packed in check-in luggage instead.

This is one of the most common causes of delayed bags, security checks, and last-minute repacking at the airport.

Items that should travel in your hand luggage include:

  • Power banks
  • Spare lithium batteries
  • Vapes and e-cigarettes
  • Valuable electronics such as laptops, tablets, and cameras
  • Important travel documents and medication

These items are generally required in the cabin because lithium batteries can present a fire risk if damaged. Keeping them in hand luggage allows cabin crew to respond quickly if an issue occurs during the flight.

 

Valuable electronics are also best kept with you, reducing the risk of loss, theft, or damage during transit.

Case Insight

This is still one of the biggest mistakes we see.

Travellers carefully check liquid restrictions, then unknowingly pack a power bank or spare battery in their check-in suitcase. If it's found during screening, your luggage may be delayed, searched, or removed from the aircraft until the item is taken out.

 

If you're unsure about batteries, electronics, vapes, or other restricted items, read our guide to Items You Are Not Allowed to Take on a Plane, where we cover the rules in more detail.
Title

Why Airline Rules Matter Just as Much

Passing airport security is only part of the journey.

Your luggage might meet all airport security requirements and still fail your airline's baggage rules.

That's because airport security checks what you can take, while airlines decide how much you can take and whether your bags meet their size and weight limits.

For example, you might travel through security with a cabin suitcase that contains only permitted items. However, if that suitcase exceeds your airline's cabin baggage allowance, you could be asked to check it into the hold or pay an additional fee at the gate.

This is particularly important when flying with low-cost carriers, where baggage allowances can vary depending on the fare you've purchased.

Case Insight

We often see travellers arrive at the airport with a perfectly packed cabin suitcase, only to discover their ticket doesn't include that size of bag.

The suitcase isn't the problem. The fare type is.

Checking your airline's baggage allowance before you travel takes only a few minutes and can help you avoid unexpected charges at the airport.

Examples of Airline Baggage Rules

Ryanair typically includes a small personal item with its basic fares, while larger cabin bags usually require Priority boarding or an upgraded ticket.

 

easyJet allows a free under-seat bag on all fares, but larger cabin bags may only be included with selected fare types or additional options.

 

British Airways generally offers more generous cabin baggage allowances, often including both a cabin bag and a personal item.

 

Jet2 includes a cabin bag allowance, but size and weight limits still apply.

Because airline policies change regularly, it's always worth checking the latest guidance before you travel.

 

You can find more detailed information in our airline-specific guides:
Title

Common Baggage Mistakes We See Every Day

Most baggage problems don't happen because travellers deliberately break the rules.

They're usually caused by small oversights that only become obvious once you're standing at security or waiting to board.

After helping travellers prepare for holidays, business trips, and long-haul flights, there are a few mistakes we see time and time again.

Toiletries Over 100ml

This is still one of the biggest reasons items get confiscated at airport security.

The issue isn't how much liquid is left in the bottle. It's the size of the container itself. Even if a shampoo or sun cream bottle is almost empty, it can still be removed if the container holds more than 100ml.

Power Banks Packed in Check-In Luggage

Many travellers know they need a power bank for their trip but don't realise it should travel in their hand luggage.

Because power banks contain lithium batteries, they are generally not permitted in check-in luggage and may be removed during baggage screening.

Case Insight

We see this all the time.

Most travellers spend more time thinking about what to pack than checking the rules that apply to their ticket. Then a simple issue, such as a power bank in the wrong bag or a cabin case that isn't included with their fare, creates unnecessary stress at the airport.

 

A quick check of your airline's baggage allowance and airport security rules before you travel can prevent most of the problems we see every day.

Cabin Bags That Exceed Airline Dimensions

A cabin suitcase might fit perfectly on one airline but exceed the allowance on another.

This is especially common when travellers assume all airlines use the same cabin baggage rules. Even a few centimetres can make the difference between boarding normally and paying an unexpected fee at the gate.

Travelling With the Wrong Fare Type

This catches people out more often than oversized luggage.

Many airlines sell fares that only include a personal item, while larger cabin bags require an upgraded ticket or additional baggage option.

Travellers often arrive with the right bag but the wrong booking.
Title

Smart Packing for Easier Travel

Understanding baggage rules is only half the battle. How you pack can make a big difference to your experience at the airport.

A well-organised bag makes security checks quicker, helps you stay within airline allowances, and makes it easier to find what you need during your journey.

Case Insight

One of the easiest ways to reduce travel stress is to organise your luggage before you leave home.

Travellers often focus on what they can and can't take, but a well-packed bag can make security checks, boarding, and even unpacking at your destination much smoother.

Choose a Lightweight Cabin Case

Choose a Lightweight Cabin Case

If you're travelling with hand luggage only, every kilogram matters.

 

A lightweight cabin suitcase gives you more of your allowance for clothing, toiletries, and travel essentials rather than the weight of the case itself.

 

The Samsonite C-Lite Cabin Spinner is a popular choice for frequent travellers thanks to its cabin-friendly dimensions, lightweight design of around 2.1kg, and durable Curv® material. It's particularly useful when flying with airlines that enforce cabin baggage weight limits.

Keep Liquids Organised

Airport security becomes much easier when your toiletries and liquids are stored together and easy to access.

 

The Tumi Response Travel Kit helps keep travel-sized toiletries organised in one place, making it quicker to remove items for screening when required.

 

It's a simple addition, but one that can save time when moving through busy airport security queues.

Use Packing Cubes to Stay Organised

Packing cubes aren't just useful for keeping clothes neat.

 

They also help separate electronics, chargers, toiletries, and travel documents, making it easier to find essential items without unpacking your entire bag.

 

Joules Packing Cubes are particularly useful for keeping different categories of items organised, helping you move through security more efficiently and making life easier once you reach your destination.
Title

Final Verdict: What Can't You Take on a Plane?

Most baggage problems happen because travellers mix up airport rules and airline rules.

Airport security controls what you can take.

Your airline controls how much you can take.

Understand both before you pack and you'll avoid most of the common issues that delay travellers at the airport.

Shop at Case

FAQ's

What's the difference between airport security rules and airline baggage rules?

Airport security rules determine what items you can take through security and onto the aircraft. Airline baggage rules determine how much luggage you can take, including cabin bag sizes, personal item allowances, weight limits, and check-in baggage allowances.

Do all airlines have the same hand luggage allowance?

No. Every airline sets its own baggage allowances. Cabin bag dimensions, weight limits, and personal item allowances can vary depending on the airline and fare type.

Can I take liquids over 100ml on a plane?

At some UK airports, passengers can now carry liquids in containers of up to 2 litres thanks to new 3D security scanners. However, many airports still follow the traditional 100ml rule. Always check the rules at both your departure and return airports before you travel.

What happens if my cabin bag is too large?

If your cabin bag exceeds your airline's size allowance, you may be asked to place it in the hold and pay an additional baggage fee. This often happens at the gate, where charges can be higher than booking baggage in advance.

Can I pack a power bank in check-in luggage?

No. Power banks and spare lithium batteries should be carried in your hand luggage. They are generally not permitted in check-in luggage because lithium batteries can present a fire risk.

What's the easiest way to avoid baggage problems at the airport?

Check both the airport security rules and your airline's baggage allowance before you travel. Most issues happen when travellers overlook liquid restrictions, baggage dimensions, weight limits, or fare-specific luggage allowances.

About the Author

Hi, I’m Simiran Gataora. I manage customer service, e-commerce admin, and social media at Case, helping customers find luggage that genuinely works for the way they travel. 

 

What started with a blog about petite suitcases quickly turned into a real love for writing, practical travel advice, and the details that make luggage easier to live with. I enjoy sharing honest, helpful advice on everything from airline rules to suitcase features, always keeping it clear, useful, and never too salesy.

 

I travel too, so I know there’s no one-size-fits-all approach to luggage. Whether it’s a tote bag for a weekend away or a lightweight check-in case for a longer trip, I’m always looking for what genuinely works, especially as someone petite. 

 

Chances are, I’m probably still checking airline baggage rules or noticing suitcases wherever I go.

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Our recommendations are based on our expertise and research in the luggage sector. Brand partners do not approve our editorial content. Warranties and airline rules can change, so always check the latest details before you fly. Every article goes through multiple expert reviews to ensure the information we provide is clear, accurate, and genuinely helpful in finding the best luggage for your needs.

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