NALGENE* PETG square media bottles are lightweight, shatter-resistant and provide excellent gas barrier properties for storage and shipping of liquid media, buffers, and sera. These sterile, non-pyrogenic bottles feature molded-in neck ring for use with tamper-evident shrink sleeves. Bottles are offered with and without closure. Bottles meet current biological and pharmaceutical regulatory standards including: USP Class VI, Non-cytotoxic, Non-pyrogenic, USP<661>, European Pharmacopoeia for Abnormal Toxicity, and trace elements.