CamelBak Upland Vest 100-ounce Hydration Pack Hydration vest combines the features of a traditional bird vest with a small pack Provides 670 cubic inches of storage, including blood-proof game bag Dual front pockets to accommodate shells and other essentials; transmitter storage compartment Omega HydroTanium reservoir embedded with HydroGuard Anti-Microbial Technology Weighs 3.06 pounds empty, 9.5 pounds when filled with water