Quantum Storage Systems Giant Ultra Bins Extra-large, high-density, heavy-duty open hopper stackable bins have a stack capacity of up to 100 lbs. and can stack up to six high. Injection molded from high-density polyethylene, bins are waterproof, will not rust or corrode, and can be cleaned easily. Molded-in divider slots and optional dividers keep parts separated and organized. Optional clear window increases capacity. Label holder provides permanent part identification. Specify Yellow, Red, or Blue.