The container ship is different from the conventional type and is an innovation noted for easier handling and quicker turnover of cargoes. Cargoes to be carried by this type of ship are pre-packed into containers before being loaded aboard the ship. Containers are sealed after being packed with cargoes. Made of metal or other durable materials,they are watertight after sealing and can therefore be stowed on deck whilst being carried. One of the features of container ships is that some of the containers are usually stowed on deck. The container ship is becoming increasingly popular in trading circles,and the trend is that the tonnage thereof will grow at a faster pace in future.