The size of a carry-on suitcase varies by airline, but most major airlines have similar size requirements. The standard size for a carry-on suitcase is around 22 x 14 x 9 inches, but some airlines have slightly different requirements. Its important to note that these measurements usually include handles and wheels, so its important to check the specific requirements of the airline youre flying with. Additionally, most airlines have a limit on the combined length, width, and height of carry-on baggage, which is typically around 45 inches. Here are some examples of carry-on size requirements for major airlines:

• American Airlines: 22 x 14 x 9 inches (including handles and wheels) for overhead items, and 18 x 14 x 8 inches for personal items.
• Delta Air Lines: 22 x 14 x 9 inches (including handles and wheels) for overhead items, and 18 x 14 x 8 inches for personal items.
• United Airlines: 22 x 14 x 9 inches (including handles and wheels) for overhead items, and 17 x 10 x 9 inches for personal items.
• Southwest Airlines: 24 x 16 x 10 inches for overhead items, and 18.5 x 8.5 x 13.5 inches for personal items.

Its important to note that some airlines may have weight restrictions for carry-on luggage, so its a good idea to check the specific requirements of the airline youre flying with before packing your bags.