A shipping container (also container, freight container, ISO container, intermodal container, hi-cube container, box, conex box and sea can) is a standardized reusable steel box with a pair of doors at one end and a wooden floor. Used for the safe, efficient and secure storage and movement of materials and products within a global containerized intermodal freight transport system. "Intermodal" implies that the container can be moved from one mode of transport to another without unloading and reloading the contents of the container. Lengths of containers vary from 8-foot (2.438 m) to 56-foot (17.07 m) and heights from 8-foot (2.438 m) to 9 feet 6 inches (2.9 m), but are most commonly 20 or 40 feet (about 6 or 12 meters) long. There are approximately seventeen million intermodal containers in the world of varying types to suit different cargoes.
