The CamelBak Charge LR is an ultra-light lumbar-based reservoir pack with MTB-specific cargo options. The Charge LR is designed to carry your multi-tool, CO2 pump and cartridges, spare tube, extra layer, energysupplements, phone, wallet and keys. The LR stands for lumbar reservoir which means that the hydration bladder is positioned low in the pack to help keep your center of gravity down while you are streaking down the trails. The Charge LR is a lightweight endurance pack for MTB racers and adventures and includes the new Antidote reservoir which has a quick-snap cap that tightens in a quarter turn and a quick-disconnect tube system.