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A suitcase (a type of luggage - that is, something one lugs, or pulls along heavily) is a narrow box-shaped bag, usually made of cloth or vinyl that has a handle at one end and is used mainly for transporting clothes and other posessions during trips.
A smaller, firmer suitcase, used mainly for transporting papers and office supplies is known as a briefcase.
Most travel institutions have special procedures for dealing with suitcases. Airports, for example, store them in a special area of the airplane during the trip, and return them to passengers using a complex system of conveyor belts.