This 250mL (8oz) square media bottle is made of durable, break-resistant polyethylene terephthalate copolyester, glycol modified (PETG) and comes with a natural high-density polyethylene (HDPE) screw closure. The crystal-clear PETG material promotes reduced permeability to CO2/O2, making it perfect for media storage. It is ideal for prolonged storage of pH sensitive liquids such as culture media. The white HDPE closure has a heat-shrink band around both closure and neck to provide a tamper-evident seal for assurance of sterility. The sterile, non-pyrogenic and noncytotoxic bottle eliminates costly washing, depyrogenation, and autoclaving steps. This bottle is graduated 'To Contain' with molded-in graduations. Gamma irradiated to 10-6 sterility assurance level (SAL), and complies with USP Class VI guidelines. Packed in shrink-wrapped trays. Graduated. Sterile. Shrink-Wrapped Tray Packed. Material: Polyethylene Terephthalate Copolyester, Glycol Modified (PETG). Bottle Style: Media Bottle. Bottle Shape: Square. Neck Style: Narrow Mouth. Closure Material: HDPE. Closure Color: White. Height With Closure: 146mm. Outer Diameter: 61 x 61mm. Neck Inner Diameter: 28mm. Neck Finish: 38-430. Capacity: 250mL (8oz). Nalgene® #: 342020-0250.