Will that 20-inch suitcase fit as a carry-on?

Get three exterior measurements

Ask for height, width and depth, including the wheels, fixed handles and any protruding parts. A “20-inch” label might refer to a nominal shell size; it does not provide all three measurements. Dimensions of the shipping box are not dimensions of the suitcase.

Check your operating airline

Look up the allowance for the airline operating each flight. American Airlines, for example, lists 22 × 14 × 9 inches (56 × 36 × 23 cm) including wheels and handles, and notes that some airports and aircraft have additional restrictions. Always consult its current carry-on page and your booking before travel.

That example is not a guarantee for another airline or every itinerary. Aircraft storage limitations can still affect whether a bag travels in the cabin.

Measure the configuration you will use

If the case expands, check it both closed and expanded. Include any bulging external pockets. A case that fits unexpanded may exceed the allowance after you add return-trip purchases.

Keep personal items separate

A carry-on suitcase and an underseat personal item can have different allowances. Do not assume that an item described as cabin luggage will fit under the seat. Review the number of bags and any fare-specific restrictions on your booking.

Apply the checklist to your shortlist

The supplied descriptions in our AliExpress luggage comparison do not establish U.S. cabin compliance for any specific variant. Ask the seller for exact exterior dimensions and empty weight, then compare them with your operating airline’s requirements. Our general luggage guide covers materials, opening styles and support.