The size limit for carry-on luggage varies by airline, but most have a limit of 45 total linear inches. The size limit is based on the bag's length, width and depth or height.
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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.
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