CamelBak's next-generation Chem Bio Reservoir 4.0 (CBR 4.0) with DuraFlex Barrier technology resists penetration by potentially lethal chemical and biological agents. Weighing less than 9 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 3-Litre CBR 4.0 fully integrates seamlessly with the HydroLink Modular Attachment System. Developed to easily integrate with current CamelBak hydration systems, the CBR 4.0 slips into any CamelBak 100-ounce reservoir pocket.