GL45 Square Media/Storage/Medium/Reagent Bottle Supplier,Wholesale,Manufacturer Pyrex® Media Bottle, 5,000mL, Low Actinic, GL-45 Cap Description. 5000 mL Low Actinic Media Bottle with GL-45 Screw Cap. ideal for media, buffers, aqueous, and nonaqueous solutions, this Heavy Duty bottle of low actinic glass for use when storing/transporting light sensitive materials.