Abstract: A variable height container for a vessel of which the upper side is open includes a bottom plate where freight is placed, a plurality of fixed posts installed on the bottom plate, a mobile post installed at each of the fixed posts to be capable of moving up and down by being guide by the fixed post to adjust the height of the container, and a fixing deice for fixing the mobile post to the fixed post so that the height of the mobile post can be fixed. Thus, the cost for transportation can be reduced, mass transportation can be possible, shipping is possible any shipping places, freight can be loaded anywhere on a deck of a ship or inside the ship. Also, rapid and free transportation can be available and the container can be folded by being folded so that a freight space can be reduced.