Stash it in your running vest, belt, or even in the palm of your hand. This lightweight, collapsible flask features the classic one-piece silicone bite valve for rapid hydration on race day, and packs down easily once it's empty. We designed the Quick Stow to fit easily in the front compartments of all of CamelBak's running vests. Once it's empty, it folds down small enough to fit in your pocket.