Features: Poycarbonate Media Bottle with Polypropylene Closure Octagonal square shape for easy pouring and space storage Graduation markings are optically clear molded-in Transparent and autoclavable Leak-proof Unequaled in design or performance, the octagonal square shape provides an Easy-Grip for pouring. Transparent and autoclavable. Use with aqueous solutions, storage of media-short term or for space saving (square) storage. The cap is made with virgin, high-temperature polypropylene (PP) and is liner-free and comes with a leak-proof guaranty. The neck ring insures security of shrink-wrapped seals and has a smooth interior so there is no fluid entrapment and no back-flow contamination. The seal ring is molded inside the cap and fits tightly against the bottle neck; insuring a leak-proof system.