A suitcase is a general term for a distinguishable form of luggage. It is often a somewhat flat, rectangular-shaped bag with rounded/square corners, either metal, hard plastic or made of cloth, vinyl or leather that more or less keeps its shape. It 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. Suitcases lock with keys or a combination.
The sturdiest suitcases are generally constructed from wood and have a covering that resists gouging and liquid from entering into the interior. The seams can be glued together or stitched with strong nylon thread. Generally the stitched together suitcases hold up over time as compared to the glued construction and have a lock or latch.
Many 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.
Some suitcases that include a telescopic handle and wheels are known as trolley cases. Trolley cases typically have two fixed wheels on one end with the handle located on the opposite for vertical movement.