20ft Shipping Container Sided Door. The 20-foot double side door container is made of corten steel. The floor is made of hardwood. The 20-foot double side door container has an unladen weight of 3,150 kg and a maximum payload of 20.850 kg. This represents total gross weight of 24,000 kg. The 20-foot double side door container has the following dimensions on the outside: 6.058 x 2.438 x 2.591 (length x width x width x in mm) and inside: 5.898 x 2.224 x 2.302 (length x width x height in mm). The door opening on the short side is 2.114 x 2.189 mm (width x height). The openings of the side doors are 5.72 x 2.189 mm (width x height). The volume of the container is 30.20 m3.