The Chem Bio Reservoir 4.0 resists penetration by potentially lethal chemical and biological agents. Weighing less than nine ounces, the CBR 4.0 Reservoir is durable, flexible, and can provide taste-free fluids on demand during regular operations or while wearing protective gear, such as MOPP 4 suits and masks. Exceeding USACHPPM TG 230A military water quality standards. CamelBak’s new 3-litre CBR 4.0 integrates seamlessly with the HydroLink Modular Attachment System.