Carry-On Sizes

Ask a frequent flier for the carry on size limit. You will get one answer fast: 22 by 14 by 9 inches. Ask an airline based in Frankfurt or Singapore and the number changes every time.

Carry on size in the United States settled into a shared convention decades ago. It was never a law. Outside North America that convention barely exists at all.

That gap between everyone knows the rule and the rule is optional is where most bag drop arguments start. This page maps the real numbers. Where the US figure came from, why the European ones do not match, whether wheels count, whether weight matters, and when an oversized bag still gets on the plane.

For the full list of what counts as carry-on versus what has to be checked, see the carry on rules page.

Where 22 x 14 x 9 inches came from, and who skips it

No federal agency sets carry on size. The TSA screens what is inside your bag, not the bag itself. So 22 x 14 x 9 inches is not a regulation anyone can point to.

It is a number that American Airlines, Delta, United, and many others landed on independently. Mostly because it fits the overhead bins on the narrow body jets that dominate US routes.

Convergence is not universal, though. Southwest allows 24 x 16 x 10 inches, noticeably roomier. A handful of smaller US carriers set their own numbers too, so check before you assume.

The European numbers, and why 55 x 40 x 20 is not 55 x 40 x 23

Europe has no equivalent of the US convergence. Cabin bag limits across major European carriers run from 55 x 40 x 20 cm up to 56 x 45 x 25 cm. Most of that gap sits in depth, the dimension a bag is thickest in.

That is not sloppy metric rounding. Each airline picked its own figure to match its own fleet, the same way US carriers did. They simply never landed on one shared number.

Our breakdown of European carry-on size by airline lists every carrier separately. Check it before booking multiple airlines on one trip.

Wheels and handles count, and that is where bags get rejected

This is the detail that catches careful packers off guard. American Airlines states its limit applies including handles and wheels. Southwest and British Airways publish the same condition.

Travelers who measure the bag body first, then add the wheel housing later, often end up half an inch over. They usually do not find out until a gate sizer says so.

Community reports back this up again and again. People measure the shell correctly, then get flagged because the spinner wheels or the handle stalk push the total past the limit. Measure the whole bag with our size checker tool before you fly, not after.

Enforcement depends on the aircraft, not just the airline

Carry on size limits get applied unevenly even within one airline. Travelers describe sizing boxes posted at every gate on some carriers, used mainly when a flight is full and bin space runs out. On a wide body international jet with more overhead room, the same airline can wave through bags it would flag on a packed regional jet.

The pattern holds across borders too. Some European carriers apply visual checks on personal items at boarding, while others barely glance at bags. One airline can hassle a traveler over a borderline bag while a codeshare partner on the same route shows no interest at all.

None of this shows up on a baggage policy page. It only shows up at the gate.

Weight limits: rare in the US, routine almost everywhere else

Most US carriers do not weigh carry on bags at all. American Airlines, Delta, and Southwest publish no weight limit for a standard carry on. Gate agents in the US almost never put a bag on a scale.

That is a policy choice, not an oversight. It is one of the biggest surprises a US traveler hits on their first international trip.

Most European and Asian carriers do the opposite. Lufthansa caps its carry on at 55 x 40 x 23 cm and 8 kg. Singapore Airlines caps total dimensions at 115 cm and 7 kg.

Community accounts describe Lufthansa and several Asian carriers actually weighing bags at the gate on busy days. That almost never happens on a US domestic flight.

Personal item size has no convention at all

If carry on size is a loose convention, personal item size is closer to chaos. British Airways publishes two different personal item allowances on one page. 40 x 30 x 15 cm for most fares, and up to 45 x 36 x 20 cm in Premium Economy.

US carriers describe a personal item as something that fits under the seat. Most never commit to an exact figure at all.

That vagueness is deliberate for the airline and frustrating for the traveler. A backpack that counts as a personal item on one airline can get flagged as a second carry on item on another.

Published carry on dimensions, carrier by carrier

The table below uses only figures published on each carrier’s own baggage page. A few come from this site’s already published European carry-on size breakdown. Where a carrier does not publish a weight limit, that is stated plainly rather than left blank.

When a soft bag beats the sizer, and when it does not

A soft duffel that measures an inch over on paper often still clears the gate sizer. It compresses. A rigid case that is truly oversized gets caught almost every time, because it has no give.

That trick stops working in a few situations. It fails on carriers that weigh bags rather than eyeball them, since a squeezed bag is still a heavy one. It also fails once a gate is oversold and agents start checking every borderline bag.

If your bag gets pulled, the usual outcome is a gate check rather than a boarding refusal. Our checked baggage guide covers what changes once that happens.

The physical sizer, a metal frame at check-in or the gate, is still the most common enforcement tool in the industry. It is low tech on purpose. A bag either drops into the frame or it does not, and that binary test rewards a soft bag over a rigid one every time.

The bottom line on carry on size

Treat 22 x 14 x 9 inches as the US default, not a universal rule. Check the actual airline before you buy a bag.

Measure wheels and handles as part of the bag. Expect weight to matter the moment you fly outside the US.

A soft bag has more margin for error than a rigid one. When the numbers matter for a specific trip, run the bag through our size checker rather than guessing at the gate.