Designed to load internally, barges specifically designed for the vessel. The concept is to quickly float the barges to the vessel (using tugs or ships wenches) load these barges through the rear of the vessel, then sails. Upon arrival at the foreign port, the reverse happens; Barges are quickly floated away from the vessel and another set of waiting barges quickly are loaded. Designed for quick vessel turn-around. Usually crane-equipped; handles mostly breakbulk cargo.