PYREX Slim Line media storage bottles provide easier handling and more efficient storage of media, biologicals, and other aqueous solutions. Features Indented gripping zones along the sides of bottle allow easier and safer handling New cap design permits faster opening and closing. The caps are fully compatible with all standard “GL45” (45 mm neck size) Pyrex bottles Widely-spaced knurls (ridges and grooves) provide comfortable and ergonomic cap handling Narrow bottle diameter allows more efficient storage on shelves, refrigerators, autoclaves. Bottles are graduated to their full working volumes Available in four sizes: 125 mL, 250 mL, 500 mL, and 1 L Pyrex Slim Line bottles are made from the same Type 1 Class A (ASTM E-438) borosilicate glass as standard Pyrex media bottles for chemical and heat resistance.