PETG Square Media Bottles protect media, laboratory reagents, and buffers during storage and transport. Perfect for cold storage, the PETG bottles remain shatterproof even at -40ºC. Low transmission rates of O2 and CO2 maintain optimum pH values for solutions in storage. PETG bottles include white HDPE caps with integrated seal rings and matching semi-buttressed threads for leakproof performance to 95kPa. Bottles are provided sterile and ready to fill with tamper-evident shrink bands in tray packs for convenience.