Most carry-on guides give you a table of numbers and stop there. The numbers are the easy part, and they are not what causes problems at the gate.
What causes problems is that the published limit and the enforced limit are two different things, that budget airlines quietly redefined what "hand luggage" includes, and that the bag you bought labelled cabin-approved was measured without its wheels.
This guide covers the limits for the airlines people fly most, and then the more useful question: which of those rules will actually be tested, and how to pack so it never matters.
1. The Numbers
| Airline | Free cabin allowance | Larger bag | Weight |
|---|---|---|---|
| Ryanair | 40 × 30 × 20 cm under-seat | 55 × 40 × 20 cm with Priority | 10 kg |
| Wizz Air | 40 × 30 × 20 cm under-seat | 55 × 40 × 23 cm with WIZZ Priority | 10 kg |
| easyJet | 45 × 36 × 20 cm under-seat | up to 56 × 45 × 25 cm with Speedy Boarding or upgrade | 15 kg |
| Delta / United / American | 22 × 14 × 9 in (≈56 × 36 × 23 cm) | — | Rarely enforced |
| Emirates | Weight-led | — | 7 kg on most routes |
Figures compiled from published airline policies and corroborated across independent sources in August 2026. Airlines change these without much notice — check your carrier before you fly, particularly on a budget fare.
Two things jump out of that table, and both matter more than the individual numbers.
2. The Under-Seat Downgrade
This is the change that catches people who have not flown a European budget carrier recently.
On a basic fare with Ryanair or Wizz Air, your free hand luggage is a bag about the size of a large backpack — roughly 40 × 30 × 20 cm, which must fit under the seat in front. The wheeled cabin case that most people picture when they hear "hand luggage" is no longer included. It requires Priority, and buying it at the gate costs substantially more than adding it online.
easyJet sits in between with a slightly larger free under-seat bag at 45 × 36 × 20 cm.
Why this matters for packing: a 40 × 30 × 20 cm bag is about 24 litres. That is a large daypack, not a suitcase. If you are flying basic on a budget carrier, you are packing for a weekend in something closer to a school bag — which is entirely doable, but only if you plan for it rather than discovering it at the airport.
The carry-on only packing guide covers how to get a trip into that kind of volume, and the 7-day packing list has the outfit maths that makes it possible.
3. Weight Versus Dimensions
Airlines fall into two camps, and they fail you in completely different ways.
Dimension-led carriers care about whether the bag fits the sizer. US majors are the clearest example — 22 × 14 × 9 inches, and weight is rarely checked at all on domestic routes. You can pack a compact bag until it is genuinely heavy and nobody will comment.
Weight-led carriers weigh your cabin bag. Emirates enforces around 7 kg on most routes, and many Asian and Middle Eastern carriers sit in the 7–10 kg range. Here the size limit is almost irrelevant — you will hit the weight ceiling long before you fill the bag.
This is the single most useful thing to know before you pack. On a weight-led carrier, a small dense bag full of books and electronics is a problem and a large bag full of clothes is fine. On a dimension-led carrier it is exactly the reverse.
If you are flying between regions, the strictest airline on your itinerary sets your real limit. A generous transatlantic allowance is no help when the domestic connection at the other end caps you at 7 kg — a trap covered in more detail in our Thailand packing guide, where domestic carriers weigh bags at the gate.
4. Who Actually Enforces
Published rules and enforced rules diverge sharply, and knowing which is which is worth more than the numbers themselves.
Strictly enforced, every time:
- Ryanair, Wizz Air, easyJet and other European budget carriers. Sizers at the gate, staff who use them, and fees attached. Assume you will be tested.
Tightening:
- United removed its dimensional tolerance in January 2026 — gate agents now reject bags exceeding the stated size even marginally. Where a bag half an inch over would previously have passed, it no longer does.
Historically loose:
- US majors on domestic routes, and most legacy carriers in premium cabins. Enforcement rises sharply on full flights, when overhead space runs out and gate-checking begins regardless of whether your bag complies.
The honest rule: pack to the published limit of the strictest airline on your itinerary. Relying on loose enforcement works until the one flight where it does not, and that flight is usually the full one where you also lose your overhead space.
5. Measure Your Bag Properly
Most "cabin approved" failures come from measuring the wrong thing.
Published dimensions are the total external size, including:
- Wheels
- Handles, both telescopic and grab handles
- External pockets, when full
- Any expansion zip you have used
Manufacturers frequently quote the body of the case only. A case advertised as 55 × 40 × 20 cm may measure 57 × 40 × 23 cm once wheels and handle housing are included, which is exactly enough to fail a Ryanair sizer.
Do this once: take a tape measure to your cabin bag, packed and with the pockets full, and write the three numbers on a note in your phone. That is your real bag size, and you never have to guess again.
Soft bags have a genuine advantage. A soft-sided bag can be compressed into a sizer; a hard shell cannot. If you routinely fly budget carriers, that is a real argument for a soft bag over a hard case, regardless of what the label says.
6. If Your Bag Does Not Fit
- Buy the allowance before you travel. Gate fees on budget carriers are typically several times the online price for exactly the same bag.
- Wear the bulk. Coat, boots, heaviest layers. This is entirely legitimate and works on every airline.
- Redistribute, do not remove. Moving items into a compliant personal item is usually possible if your personal item is not already full.
- Take out what must not go in the hold before you hand it over: power banks and spare lithium batteries, medication, documents, and anything valuable or fragile. Our power bank rules guide covers why the battery point is not optional.
- Do not argue at the gate. Agents have no discretion on budget carriers and the queue behind you is not on your side.
7. The Practical Approach
Three habits remove almost all of this friction.
Own one bag that clears the strictest limit you fly. If your travel includes European budget carriers, a bag that fits 40 × 30 × 20 cm handles literally every airline in the world. Constraining yourself once is easier than checking rules every trip.
Check the fare, not just the airline. "Ryanair allows a cabin bag" is true and useless. What matters is whether your specific fare includes Priority. This is the single most common source of unexpected gate fees.
Weigh it at home. A luggage scale costs very little and removes the entire category of weight-led surprises. If you fly Emirates or an Asian carrier, this matters more than any measurement.
8. Building It Into Your List
The reason carry-on limits cause stress is that they turn packing into a constraint problem, and constraint problems are much easier when you can see the split before you leave.
In PackPilot, assign every item to a specific bag and the cabin bag versus personal item split is visible at home rather than at the gate. Set your trip length and activities, and Zippy scales the list to what you are actually carrying. Bag compliance warnings flag anything that cannot legally travel in the hold, which is exactly what you need to know in the ninety seconds before a bag gets gate-checked.
The capsule wardrobe approach is the other half of the answer — a coordinated palette is what makes a 24-litre bag cover a whole trip.
9. A Note on These Figures
Airline baggage rules change frequently, differ by route and fare class, and are sometimes applied differently by individual airports. The figures here were compiled and corroborated across independent published sources in August 2026 and are a starting point, not the final word.
Before you fly, check your specific airline, on your specific fare. If a dimension here is the deciding factor for what you pack, spend the two minutes confirming it on the airline site. If you find something out of date, tell us and we will correct it.
Related Travel Guides
- How to Pack Light: The Ultimate Carry-On Only Travel Checklist
- 7-Day Packing List: What to Pack for a One-Week Trip
- The Ultimate Capsule Wardrobe for Travel: Pack for 2 Weeks in a Carry-On
- Weekend Trip Packing List: Two Nights in One Small Bag
- Expert Travel Packing Guides & Checklists
- PackPilot AI Travel Checklist App
Frequently Asked Questions
There is no global standard, which is the root of the problem. US carriers converged on 22 x 14 x 9 inches, roughly 56 x 36 x 23 cm. European budget carriers are considerably smaller and split their allowance into a free under-seat bag and a paid overhead bag. A case that clears a US gate can be refused in Europe, so check the specific airline rather than assuming a bag is universally compliant.
Yes, always. Published dimensions are the total external size of the bag including wheels, handles, and any external pockets. Manufacturers sometimes quote the body of the case only, which is how a bag advertised as cabin-approved fails at the gate. Measure your bag yourself with a tape measure rather than trusting the label.
A small under-seat bag of roughly 40 x 30 x 20 cm. That is it. The larger wheeled case most people picture as hand luggage requires Priority on Ryanair or WIZZ Priority on Wizz Air, and without it you will be charged at the gate. easyJet is slightly more generous with a 45 x 36 x 20 cm free under-seat bag.
European budget carriers enforce strictly and consistently, using sizers at the gate with fees attached. Legacy and US carriers historically enforced loosely, though that has been tightening — United removed its dimensional tolerance in January 2026. Assume enforcement on any budget carrier and on any full flight.
You pay a gate fee, which is typically far higher than the same bag booked online in advance, and the bag goes in the hold. If your bag is borderline, buying the allowance before you travel is almost always cheaper than arguing at the gate. Take anything fragile, valuable, or battery-powered out before it is taken.
Yes. Assign items to specific bags and you can see what is in the cabin bag versus the personal item before you leave home, rather than discovering the split at the gate. Set the trip and activities and Zippy scales the list to fit, and bag compliance warnings flag items that cannot legally travel in the hold.