The CamelBak Stoaway 3L Hydration Reservoir transforms almost any pack into a hydration pack. With a Crux reservoir, it gives you the convenience of an ergonomic handle and a leak-proof on and off lever, as well as delivering 20% more water per sip compared to earlier models. 10mm of closed-cell foam insulate the reservoir and tube against the changing temperatures to make sure your water flows when you need it, regardless of the season.