Traditional cargo is made up of various shapes and sizes of container which need a lot of men a lot of time to load and stow into ships. The idea of containerization is that all goods are pre-packed into standard sized containers which are the same height and width and in two standard lengths (twenty by Forty feet). The width and height is determined by the sizes of the roads, bridges and railway tunnels. Container lengths are more variable and go up to 40 feet. This means containers can be moved quickly by machines which move them between different kinds of transport: railway trucks Lorries, cranes and ship can all be designed to handle containers. Containers can be opened by the exporters and needn’t be opened except for customs inspection until reaching the customers. So delivery is much faster than before. But the capital cost of new containers equipment is very high indeed. Only big ports have changes to container systems. Small ports still use traditional methods on unloading and loading.