The CamelBak Bootlegger™ Hydration Pack is a cold-weather version of a hydration vest. It features extra-light, breathable materials and two sternum straps for a secure, bounce-free fit, plus an insulated drink tube to keep your water from freezing in cold temperatures. This hydration pack keeps 1.5 liters of water tucked away under your jacket with the ultimate low-profile design. The brand new Crux Reservoir delivers 20% more water per sip, with an ergonomic handle for easier refilling. Carry your hydration in stealth mode with the CamelBak Bootlegger™ Hydration Pack.