Stash it in your running vest, belt, or even in the palm of your hand. This lightweight, collapsible flask features our 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 our running vests. Once it’s empty, it folds down small enough to fit in your pocket. Each flask holds 500 ml of water and features a shut-off valve for leak-free storage. Unscrew the cap, and you’ve got an extra-wide mouth that makes it easy to add ice or drink mixes. Read Less