Airline Luggage Regulations Guide

Understand airline baggage rules for underseat, cabin and check in luggage

Airline baggage regulations can vary depending on the airline, route and the type of ticket you purchase. 

Understanding these rules before you travel helps you avoid unexpected fees, delays at the gate and last-minute repacking at the airport.

This guide explains how airline luggage regulations work across the three main categories: underseat, cabin and check in luggage. 

Use this page to understand the rules, then explore each detailed guide for airline-specific allowances.

Quick Access to Airline Regulations

Underseat Luggage Regulations
Covers personal item allowances that fit under the seat in front of you.
Includes typical sizes, airline differences and what counts as a personal item.

Cabin Luggage Regulations
Covers overhead locker bags, including size and weight limits across airlines.

Check In Luggage Regulations
Covers hold luggage allowances, including weight limits, size rules and ticket differences.

Airline Underseater Regulations

Airline Cabin Luggage Regulations

Airline Check In Regulations
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How Airline Luggage Regulations Work

Airlines set their own baggage policies, but most follow a similar structure based on three key factors:

1. Size limits
Each airline defines maximum dimensions for bags. These always include wheels, handles and any external pockets.

2. Weight limits
Weight allowances vary by airline and ticket type. Cabin luggage is often limited to 7 to 12kg, while check in luggage typically starts at 23kg.

3. Ticket type
Your baggage allowance depends on the type of ticket purchased. Basic fares may only include a small underseat bag, while higher fare types may include cabin and check in luggage.

4. Route and aircraft type
Some long haul routes or smaller aircraft may have different restrictions, particularly for cabin baggage.
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Underseat, Cabin and Check In Explained

Underseat luggage
This is your personal item. It must fit under the seat in front of you and is usually included with all tickets. Common examples include small backpacks, handbags and compact travel bags.

 

Cabin luggage
This is your main carry on bag stored in the overhead locker. Not all tickets include this, especially on low cost airlines.

 

Check in luggage
This is larger luggage placed in the aircraft hold. It is usually included only with certain fare types or purchased separately.
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Typical Airline Size Guidelines

While rules vary, most airlines follow general size ranges:

  • Underseat luggage: approximately 40 × 30 × 15cm to 45 × 36 × 20cm
  • Cabin luggage: approximately 55 × 35 × 25cm to 56 × 45 × 25cm
  • Check in luggage: typically up to 158cm total dimensions (height + width + depth)

Always check your specific airline before travelling, as limits can change.
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Weight Allowances Explained

Airlines use two main systems for check in baggage:

 

Per bag allowance
Each suitcase has a fixed weight limit, usually 23kg in economy.

 

Combined allowance
You are given a total weight across multiple bags, which can be split between them.

Cabin luggage weight is usually stricter and may be checked at the gate.
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Common Airline Baggage Rules to Know

  • All dimensions include wheels and handles
  • Liquids in cabin luggage must follow airport security rules
  • Power banks and lithium batteries must travel in cabin luggage, not checked baggage
  • Overhead locker space is not guaranteed, even if your ticket includes cabin luggage
  • Bags may be checked at the gate if flights are full
  • Some airlines prioritise boarding for passengers with cabin luggage included
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Common Mistakes Travellers Make

  • Assuming all airlines allow the same cabin size
  • Confusing underseat allowance with cabin allowance
  • Not checking the baggage included in their ticket
  • Packing overweight bags and paying airport fees
  • Measuring the case without including wheels and handles

Case insight

Many travellers check airline rules but overlook how strict underseat allowances can be. 

These are often enforced more closely than cabin luggage, especially on low cost airlines, so choosing the right size bag makes a big difference at the gate.
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Before You Fly: Quick Checklist

  • Check your airline and route
  • Confirm your baggage allowance on your ticket
  • Measure your bag including wheels and handles
  • Weigh your luggage before leaving home
  • Allow extra space for return travel
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Explore Full Airline Regulations

For detailed airline-by-airline rules, including specific dimensions and allowances, view the full guides below:

→ Airline Underseater Regulations
→ Airline Cabin Luggage Regulations
→ Airline Check In Regulations
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Frequently Asked Questions

Do all airlines have the same baggage rules?

No, each airline sets its own size and weight limits. Always check your airline before travelling.

Do cabin bag measurements include wheels?

Yes, all measurements include wheels, handles and external parts.

Is check in luggage included in every ticket?

No, many basic fares do not include check in luggage. It often needs to be added.

Can I take both an underseat bag and a cabin suitcase?

Only if your ticket allows both. Some airlines only include one item.

 

What happens if my bag is too big or heavy?

You may be charged additional fees at the airport or required to check the bag into the hold.
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Discover More

Explore our full range of luggage guides to help you understand sizing, packing and choosing the right travel bag for your journey.

 

Suitcase Size Guide
Compare cabin, medium and large suitcase sizes before travelling.

 

Cabin Luggage Size Guide
Learn standard cabin suitcase dimensions and airline restrictions.

 

Check-in Luggage Size Guide
Everything you need to know about hold luggage sizes and weight limits.

 

Underseat Luggage Size Guide
Understand airline underseat limits and the best bags for short trips.

 

Travel Backpack Guide
Discover the best backpacks for travel, commuting and weekend trips.

 

Duffle & Holdall Travel Guide
A practical guide to choosing the right duffle or holdall.

 

Luggage Care & Maintenance
Get tips to keep your suitcase performing trip after trip.

 

Register Your Bag
Register your product for warranty and support.

 

FAQs
Browse answers to common questions about orders, delivery and returns.

 

Shop all luggage and travel bags at Case.