The CamelBak Quick Stow Flask Tube Adapter turns the Quick Stow and Quick Stow Chill soft flask into a hydration reservoir, allowing for hands-free drinking when you're running and hiking. The convenient adapter screws onto the upper portion of the soft flask, so you can place it within a pocket or pack for easy drink routing. The sipping valve only delivers liquid when you bite down, preventing it from spilling when not in use.