Similar to checked bag size restrictions, carry-on luggage comes with its own set of rules. These rules include the dimensions of your carry-on bag and personal item, and in some scenarios ...
Many airlines don't list the exact underseat dimensions ... under the seat as "a purse or laptop bag or item of similar size." Delta has a maximum carry-on size of 22 inches by 14 inches by ...
22 x 18 x 10 in United Airlines All 56 x 35 x 22 cm; 22 x 14 x 9 in Remember, you'll need to lug your carry-on bag or suitcase across the airport and down long corridors, and you might even need ...