designating lightweight luggage designed to be carried onto an airplane by a passenger, esp. if small enough to fit under an airplane seat or in an overhead compartment
noun
such a piece of luggage
See carry-on in American Heritage Dictionary 4
(kărˈē-ŏnˌ)
adjective
Small or compact enough to be carried aboard and stowed on an airplane, train, or bus by a passenger: carry-on luggage.