These bottles offer proven dependability for storing, shipping and handling chemicals in both liquid and powder form. Molded from low-density polyethylene, they feature a heavy threaded, leakproof screw cap closure with an inner seal. The 5000 and 10,000 ml sizes are made of high-density polyethylene and have an octagonal shape. Note: 5000 and 10,000 ml sizes are not leakproof and are best used for powders.