Carry-on bags are subject to size and weight restrictions that ensure they will stow safely in overhead bins. The federal government also imposes constraints on each bag's contents to optimize travel security.
Maximum linear measurement allowed for a carry-on bag on domestic U.S. flights is 45 inches as of November 2010. This is calculated by adding the length, width and height of a standard piece of luggage measuring 22 inches high by 14 inches wide by 9 inches deep. Depending on the airline, this bag must weigh no more than 40 to 50 pounds.
No federal standard exists for carry-on bag size or weight. You should confirm guidelines with your specific airline.
Carry-on luggage that does not meet these restrictions will be checked-in and charged baggage fees. Irregularly shaped carry-on bags within the size limitation may or may not be allowed. International flights tend to be much more restrictive.
