Abstract: A transportable cargo container for transporting bulk volumes of cargo, some of which may be hazardous material, including: a rectangular floor member and roof member having the same dimensions; an opening in the roof member for the introduction of the cargo; a support channel attached to the roof member for increasing the structural strength of the roof member; and wall members extending therebetween having lengths the same as the floor member; where the floor, roof, and wall members are attached by continuous-seal welds; a hatch member for each of the openings in the roof member for sealing the openings; a flexible gasket positioned around the perimeter of the side of the hatch most proximate to the roof member for preventing leakage of the cargo out of the hatch when closed; a door located in an end wall for the removal of the cargo; a latch attached to a central portion of the door for sealing the door; where the latch comprises an extendible wedge member for engagement with a portion of the wall member i