Suitcase is a somewhat flat rectangular-shaped bag with rounded corners, either hard plastic or soft or made of cloth, vinyl or leather that more or less keeps its shape. Suitcase has a carrying handle on one side and is used mainly for transporting clothes and other possessions during trips. It opens on hinges like a door.Some suitcases include a telescopic handle and wheels. Suitcases lock with keys or a combination. Originally, suitcases were made of wool or linen.Most modern suitcases have built-in small wheels enabling them to be pulled along on hard flat surfaces by a fixed or extendable handle or by a retractable or stowable leash. Suitcases are a type of luggage. A smaller, firmer suitcase, used mainly for transporting papers and office supplies is known as a briefcase.