Camelbak antidote lumbar reservoir anatomic shape of the reservoir places the weight close to your hips where your body can carry it efficiently low profile fit with baffling helps keep water in place for increased stability and comfort on your run or ride bite valve is easy to use just bite and sip hydrolock valve shuts off water preventing leaking during transport wide mouth easy open cap makes cleaning and filling the reservoir a snap polyurethane construction materials are 100 fre