Nalgene 2019 Sterile Square PETG Media Bottles with Closure can help eliminate costly washing, depyrogenation and autoclaving steps. These bottles are certified sterile and non-pyrogenic. Ideal for storage and sampling of active pharmaceutical ingredients and bulk intermediates. They are also well suited to the preparation and containment of buffers, cultures or prolonged storage of pH-sensitive liquids such as culture media. Heat-shrink band around closure and neck for tamper-evident seal. Suitable for frozen storage down to -40°C. Leakproof bottles with HDPE closures provided.