The standard accepted length for a piece of carry-on luggage is 22 inches. Some airlines will allow bags as large as 24 inches.
The maximum width for a piece of carry-on luggage is 14 inches on most airlines. Some airlines will allow luggage pieces as wide as 16 inches.
The standard depth or height for a piece of carry-on luggage is 9 inches. Some airlines will allow bags as large as 10 or 12 inches.
Some airlines allow passengers to carry on bags as large as 55 inches. Airlines with a hard limit of 45 inches may reject carry-on bags that are less than 45 inches but are of an unusual shape.
