Abstract: A system for transporting bulk material, including a container having a top, bottom, left and right sides, a front end and a back end, comprising a pair of doors which are hinged on one edge at the back end of the sides of the container and meet at the other edge in a closed condition, a first vertical retainer positioned on the bottom and extending toward the top of the container, one end of which is wedged against the right side of the container in spaced relation to the back end thereof, the other end of which is positioned against the free end of the left door in a closed position, and a second retainer which is positioned on the bottom of the container and is inclined outwardly toward the left door of the container and toward the left side thereof, having one end wedged against the left side of the container and the other end positioned against the lower portion of the first retainer and the left door of the container, a flexible liner supported within the container, one end of which abuts the retainers,