The standard international carry-on size typically varies slightly between airlines, but a common guideline is 21.5 x 14 x 9 inches (55 x 35 x 22 cm), including handles and wheels. This size is generally accepted by many major airlines worldwide, ensuring that your bag fits in the overhead compartment without any issues. However, it’s always wise to check the specific requirements of the airline you’ll be flying with, as some carriers may have stricter or more lenient policies.Additionally, weight restrictions for carry-on luggage can also differ between airlines and regions. For example, European airlines often enforce stricter weight limits compared to U.S. carriers. To avoid any surprises at the gate, make sure to verify both the size and weight allowances before you pack. This will help ensure a smooth boarding process and prevent any potential fees or hassles associated with oversized or overweight luggage.