Most US airlines cap carry-on size at 22 inches long, 14 inches wide and 9 inches high, including handles and wheels. When it comes to buying a checked bag, you'll want something between 25 and 29 ...
Introduction to Airline Baggage Fees Baggage ... the first checked bag costs $35 and $45 for a second bag. Carry-on bags and a personal item are free on most routes, including for Basic Economy ...