Ocean going ship designed to carry containers both internally and on deck. Container vessels eliminate the individual hatches, holds and dividers of the traditional general cargo vessels. The hull of a typical container ship is a huge warehouse divided into cells by vertical guide rails. These cells are designed to hold cargo in pre-packed units ? containers. Container ships are generally distinguished into seven major size categories: small feeder, feeder, feedermax, panamax, post-panamax, new panamax and ultra-large (cape size).