A suitcase 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.

Suitcase
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 plane during the trip, and return them to passengers using a complex system of conveyor belts.