The size of a carry-on luggage permitted on planes is usually 45 to 62 linear inches in size and between 15 to 40 pounds. The size of carry-on luggage permitted varies from airline to airline, so travelers must check the airline carrier's luggage regulations.
Airlines usually allow people to carry two carry-on pieces of luggage for international flights, but that is subject to change if the flight is fully booked. Carry-on luggage must be small enough to fit into an overhead bin or under the seat. Business class passengers are sometimes allowed to bring larger carry-on luggage than economy passengers because they pay more money for the flight.