What size suitcase is a carry-on?
The airline limit is 22 x 14 x 9 inches including wheels. The number printed on a suitcase is not that measurement, which is where the trouble starts.
By Michael W. · Last updated October 6, 2026
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A carry-on suitcase is one that measures no more than 22 x 14 x 9 inches including wheels and handles, which in retail terms means a case labeled 21-inch or 22-inch. Buy the 21-inch. That is the direct answer, and the reason to go a size down is in the next paragraph.
Suitcase labels describe the case body, not the bag. Travelpro publishes both figures for its own cases: the Maxlite 5 21-inch carry-on spinner has case dimensions of 21 x 14 x 9 inches and overall dimensions of 23 x 14.5 x 9 inches once wheels and handles are counted. The Platinum Elite 21-inch is 21 x 14 x 9 as a case and 23.5 x 14.5 x 9 overall. Both of those overall heights exceed 22 inches - and overall is what a gate sizer measures.
In practice those bags fly in overhead bins every day, because most gates do not measure and most bins take them. But if you want a suitcase that clears a sizer with no argument, buy a case labeled 20 inches, not 22. The airline figures by carrier are in carry-on size by airline.
Labeled size versus actual measurement
| Suitcase | Label | Case dimensions (in) | Overall (in) | Clears 22 x 14 x 9? |
|---|---|---|---|---|
| Travelpro Maxlite 5 carry-on spinner | 21 inch | 21 x 14 x 9 | 23 x 14.5 x 9 | Over on height and width |
| Travelpro Platinum Elite carry-on spinner | 21 inch | 21 x 14 x 9 | 23.5 x 14.5 x 9 | Over on height and width |
| Travelpro Maxlite 5 expandable spinner | 25 inch | 25 x 18 x 11 | 27 x 18.5 x 11.5 | No - this is a checked size |
| Travelpro Platinum Elite expandable spinner | 25 inch | 25 x 18 x 11.25 | 28 x 18.5 x 11.75 | No - this is a checked size |
The short answer, by labeled size
- 19 and 20 inch: carry-on, comfortably, even once wheels are counted. This is the size to buy for budget carriers.
- 21 inch: the retail standard for carry-on. Accepted on mainline US carriers in practice; over the published figure once wheels are included.
- 22 inch: sold as carry-on and matches the 22-inch limit as a case body, but the overall measurement is clearly over. Risky at a strict gate.
- 24 inch and up: checked. Southwest and Frontier publish 24 x 16 x 10, so a 24-inch case is cabin-legal there and nowhere else major.
- 25 to 29 inch: checked only, and the binding limit becomes 62 linear inches and 50 lb rather than a cabin envelope.
The `average carry-on luggage size` question has the same answer from a different direction: 22 x 14 x 9 inches is the figure most major US carriers publish, which is about 56 x 36 x 23 cm. It is a commercial convention rather than a standard, and there is no regulator behind it.
Why the number on the bag is not the number that matters
Luggage has been sold on case dimensions for decades, because that is the number that describes the packing space you are buying. Airlines measure the object, which includes the spinner wheels underneath and the telescoping handle housing on the back.
The gap is usually one and a half to two and a half inches in height and half an inch in width. That is why the same bag is honestly described as a 21-inch carry-on by its maker and measured at 23 inches by a sizer, and why neither party is lying.
Look for the overall figure
Good manufacturers publish both. Travelpro labels them Case Dimensions and Overall Dimensions. If a listing gives you only one number, assume it is the case body, which is the optimistic one.
How to measure the suitcase you already own
- Pack the bag the way you will actually travel with it, including the expansion zip if you intend to use it.
- Stand it upright on a hard floor. Measure from the floor - the wheels are part of the height.
- Measure the depth over the handle housing and over any external pocket you have filled.
- Measure the width at the widest point, which is usually across the wheel housings rather than across the shell.
- Write all three numbers in your phone. You will want them the next time you buy a bag.
If one dimension is marginally over, a softside bag will usually still go into a sizer because the fabric gives. A hard shell will not. Cabin baggage size goes into what to do when you are a centimeter over, and hardside vs softside luggage covers that trade properly.
The carriers where the answer changes
Three US carriers publish something other than 22 x 14 x 9, and they are the whole reason this is confusing. Southwest and Frontier both publish 24 x 16 x 10 inches, which is genuinely more generous. Spirit publishes 22 x 18 x 10.
Buying to the generous figure is the trap. A 24-inch case bought for Southwest is oversized on every mainline carrier and almost everywhere outside the US, where the common figure is around 55 x 40 x 23 cm with a 7 to 10 kg weight limit attached - see international carry-on dimensions.
Buy to the strictest limit you fly regularly. That is the only rule here that survives contact with an itinerary.
The second bag is a separate question
A carry-on allowance is usually two bags: the cabin bag that goes overhead and a personal item that goes under the seat. Those have different limits, and on ultra-low-cost carriers the personal item is the only free one.
Personal item size by airline has those figures, and best personal item bags is the shortlist of bags built to them.
Quick picks
The short list. Tap any row for the full write-up, including what each one is bad at.
| # | Product | Best for | Price |
|---|---|---|---|
| 1 |  Amazon Basics 20-inch Hardside Spinner Undersized against the standard on purpose, which is the point. | Strict gates | |
| 2 |  Travelpro Maxlite 5 Carry-On Spinner The 21-inch benchmark, and light enough for a weighed cabin allowance. | Mainline carriers | |
| 3 |  Osprey Farpoint 40 Travel Pack Frameless and compressible, so it fits whatever envelope you are given. | Carry-on-only flyers |
The one to buy if you want no argument at the gate
Amazon Basics 20-inch Hardside Spinner
Anyone flying ultra-low-cost carriers, where the sizer is a revenue instrument rather than a formality. Starting from a 20-inch case means the wheels and handle still leave you inside the envelope, which a 21 or 22-inch case does not.
The specs that decide it
- Label: 20 inch - deliberately a size below the limit
- Shell: Hardside, so the shape is predictable in a sizer
- Wheels: Spinner
- Why undersize: Leaves room for wheels and handle inside 22 x 14 x 9
Flaws but not dealbreakers
You give up real packing volume to buy certainty, and a rigid shell has no give - an overpacked hardside simply does not go in. Budget construction also means the wheels and handle are the first parts to complain.
The one if you want the normal carry-on size, done well
Travelpro Maxlite 5 Carry-On Spinner
Travelers on American, Delta, United, JetBlue and Alaska, where a 21-inch case is the accepted norm and gates rarely measure. Softside construction also compresses slightly in a sizer, which a hard shell will not.
The specs that decide it
- Case dimensions: 21 x 14 x 9 in, per Travelpro
- Overall dimensions: 23 x 14.5 x 9 in including wheels and handles
- Weight: 5.4 lb empty, per Travelpro - low for a wheeled carry-on
- Shell: Polyester softside, which gives slightly at a tight gate
Flaws but not dealbreakers
The published overall height of 23 inches is above the 22-inch standard, so it is not a bag that survives a strictly enforced sizer. Using the expansion zip puts it further outside the envelope.
The one that sidesteps the measurement entirely
Osprey Farpoint 40 Travel Pack
Travelers who would rather not own the problem. A frameless pack packed at two-thirds compresses into a sizer in a way no wheeled case can, and it has no wheels or handle housing to add inches in the first place.
The specs that decide it
- Capacity: 40 liters - a week or more with one laundry stop
- Shape: Frameless, so it compresses to the envelope offered
- Harness: Stows away behind a panel for check-in
- Weight: Light, which matters on a 7-10 kg cabin limit
Flaws but not dealbreakers
You carry the weight, which over a long terminal is tiring and wrong if you have back or shoulder problems. Packed to its full 40 liters it is over the comfortable carry-on volume, so the flexibility only exists if you under-pack it.
Frequently asked questions
What size suitcase is a carry-on?
Is a 21-inch suitcase a carry-on?
Is a 24-inch suitcase a carry-on?
What is the average carry-on luggage size?
Do carry-on dimensions include the wheels?
What happens if my carry-on is too big?
Sources
- Travelpro - Maxlite 5 21in Expandable Carry-On Spinner (case 21 x 14 x 9 in, overall 23 x 14.5 x 9 in, 5.4 lb) (read 2026-10-06)
- Travelpro - Platinum Elite 21in Expandable Carry-On Spinner (case 21 x 14 x 9 in, overall 23.5 x 14.5 x 9 in, 7.8 lb, 46 L) (read 2026-10-06)
- American Airlines - carry-on baggage (22 x 14 x 9 in standard)
- Southwest Airlines - carry-on baggage policy (24 x 16 x 10 in)
- Spirit Airlines - bag sizes and fees (22 x 18 x 10 in carry-on)
Read next
- Carry-on size by airline
- Suitcase sizes in inches
- Cabin baggage size
- International carry-on dimensions
- Best carry-on luggage
- Personal item size by airline
More in Airline Rules, or see every roundup and comparison on the site.