Every roundup starts at $190. So we went looking under $80 instead — and found that most of the bags everyone recommends fail once wheels and handles are counted. Here is what we could verify, and what we could not.
Cabin Max Metz Stowaway 20L — about $35 to $45. 40 × 25 × 20 cm, which is 15.75 × 9.84 × 7.87 inches. Clears United’s 17 × 10 × 9 and every other US personal item limit. 1.1 lb, 20 litres, three-year warranty.
Two reasons we trust this number more than most. The brand publishes it as the external size, and it is a backpack — no wheels, so the single biggest source of error in this niche does not apply. And 40 × 25 × 20 cm works out to exactly 20 litres, which is what the brand claims the capacity is. When the arithmetic agrees with the marketing, the dimensions are usually real.
The catch, stated plainly: 9.84 inches against a 10-inch limit is about a sixth of an inch of margin. It is a soft bag, so it will bulge if you overpack it. Do not fill it to the seams and expect it to gauge on United.
On carry-ons under $80 we came up empty. Not one bag at that price had clear, unambiguous evidence of true 22 × 14 × 9 compliance including wheels and handles. Either the spec quietly omits the wheels, or two credible sources disagree by an inch. We would rather tell you that than fill the gap.
| Bag | Sold as | Actually measures | Why it fails |
|---|---|---|---|
| Amazon Basics Underseat Carry-On 14″ B071G2D5MM |
“Fits under the seat” | 14.1 × 13.3 × 9.4 in including wheels | Fails United (13.3 over the 10-inch axis) and fails 18 × 14 × 8 (9.4 over the 8-inch axis). The most-recommended budget underseater on the internet fits neither personal-item spec. Sourcespec |
| Travelers Club Chicago 20″ B07V1KGJF1 |
“20-inch carry-on” | Interior 20 × 13.4 × 8.6 / exterior 23 × 15.5 × 10.5 in | The textbook packing-case-versus-overall trap. The number in the name is the inside of the bag. Sourcespec |
| SwissGear 4010 “Carry-On 18-inch” B08KYG83TG |
18-inch carry-on | Packing 16 × 13.5 × 7.5 / product 21.5 × 15 × 9 in with wheels and handles | Fails on width — 15 inches against a 14-inch limit. The retailer states the wheel inclusion explicitly, so this one is checkable. Sourcespec |
| Amazon Basics 20″ Hardside Spinner | Carry-on | Physically measured at 22.0 × 14.8 × 10.0 in | Over on two axes. This one was measured by a testing lab rather than taken from a spec sheet. Sourcespec |
| Rockland Melbourne 20″ B004HKSENY |
“Meets US domestic standards” | Measured over the limit even unexpanded | OutdoorGearLab, having measured it: “the bag’s measurements do not actually comply — it’s one inch too long… even without expansion.” Sourcespec |
| NINETYGO “Carry on Luggage 22x14x9″ | 22 × 14 × 9 — in the product name | Retailer lists 22.5 × 15 × 9 in | The compliance claim is the product title. The spec sheet on the same page contradicts it. Sourcespec |
Dimensions are the retailer’s or manufacturer’s own published figures, except where noted as physically measured by a testing lab. We have not measured these bags ourselves, and we say so rather than implying we have.
A spec that says external, or including wheels and handles, is a measurement. A bare number next to a bag is usually the packing case. If the listing does not say which, assume the case.
Multiply the three dimensions and convert to litres. If a bag claims 23 litres but its stated dimensions work out to 33, the dimensions are a bounding box rather than the bag. If they agree, the numbers are probably real.
A bag listed at precisely 17 × 10 × 9 or 22 × 14 × 9 has often had its dimensions copied from the airline’s policy rather than measured. Some are genuinely built to the gauge; many are drop-shipped listings with no manufacturer behind them.
Several budget carry-ons comply until you unzip the expander, then gain an inch or two of depth and fail outright. The compliant number is almost always the unexpanded one.
Found something you like? Put its dimensions in and we’ll score it against every carrier before you buy.
Because manufacturers measure the packing case and airlines measure the outside of the bag. A suitcase sold as "20-inch" is routinely 22 to 23 inches once wheels, handles and external pockets are counted, and every US airline measures the outside.
The Cabin Max Metz Stowaway 20L, at roughly $35 to $45. It is 40 x 25 x 20 cm, which the brand publishes as the external size, and it has no wheels — so the usual wheels-included ambiguity does not apply. Note the 9.84-inch axis leaves only about a sixth of an inch against the 10-inch limit, so do not overpack it.
We could not find one we would stand behind. At that price we found no bag with clear, unambiguous evidence of true 22 x 14 x 9 compliance including wheels and handles — either the dimensions omit the wheels, or two credible sources disagree. We would rather say that than recommend something we have not verified.
Look for a manufacturer spec that says "external" or "including wheels and handles". Then sanity-check it: multiply the three dimensions and compare with the claimed litre capacity. If the volume implied is far bigger than the stated capacity, the numbers are a marketing envelope rather than a measurement.
Manufacturers publish dimensions inconsistently, and a “20-inch” spinner is almost never 20 inches once you count the wheels. Where a brand states dimensions including wheels and handles, that’s the number we use. Where it only publishes the case, we say so on the card. Airlines measure the outside of your bag — wheels, handles, straps and all. Anything marked borderline is down to the gate agent, and remember that a soft bag squashes into a sizer while a hard shell won’t.
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Limits verified August 2026 against each carrier’s published policy. Airlines change these without notice — always confirm before you fly. Spirit Airlines ceased operations on 2 May 2026 and is no longer listed.
Airline Bag Size Checker v1.0.15 · last updated 2026-08-12