w Vented, GL45 caps with 0.22 µm PTFE hydrophobic membranes (Cat. No. 16157-412) w Open Top, PBT caps in GL25, GL32, and GL45 sizes w Silicone or PTFE-faced Silicone Septa for the open-top caps. PYREX reusable laboratory bottles are designed as storage vessels for reagents, sterile tissue culture media and components, biological fluids,