This is a true supported lift bag for heavy haul requirements. Lap seams on edges for security, independent self-balancing slings, rugged 32oz. vinyl bottom, Removable vinyl waterproof liner, grab handles, and roll top closure. The LUSB104 has a cubic volume capacity of 8192 cubic inches and 400# safe load rating. One of the most well thought lifting solutions on the market today, LUSB continues to advance proper design for safe lifting operations.