Sterile Square Media Bottle, PETG (polyethylene terephthalate copolyester)bottle, white HDPE screw closure Inexpensive alternatives to glass media bottles. These heavey-walled durable, square PETG bottles are graduated to contain. Reduced permeability to CO 2 /O 2 . Bottles and closures are radiation-sterilized and nonpyrogenic to eliminate costly washing, depyrogenation and autoclaving steps. Heat-shrink band around closure and neck provides tamper-evident seal to assure sterility. Packed in shrink-wrapped trays. Sold by the case only. 2-L size (Cat. No. 2019-2000) has molded-in handgrips and a 53-mm (53B) white closure. Sterile/Transparent/Leakproof†/Graduated