Boston Square Lab Storage Bottle, HDPE, 1L, 45mm (GL45) Cap USP Class VI Certified HD Vacuum Bottles are available in HDPE, Polypropylene, EZclear Copolyester, and Polycarbonate. Bottle material and volume are molded Boston Square Lab Storage Bottle, HDPE, 4L, 45mm (GL45) Cap USP Class VI Certified.