These round bottles offer proven dependability for storing, shipping, and handling chemicals in both liquid and powder form. Molded of low density polyethylene, they feature a heavy threaded, leak proof design screw cap closure with an inner seal. The 5000 and 10000mL sizes are made of high density polyethylene and have an octagonal shape. Note: Cat.Nos. 8-F10906-5000 and 8-F10906-0010 are not leakproof and are best used for powders.