Perfect for your more technical runs and workouts, this lightweight & minimal hydration belt from CamelBak stores a 17 oz. Quick Stow flask that molds to your body shape. The 3D mesh material is ultra-breathable, and the extra stretch pocket keeps keys, cards, and other necessities safely tucked inside. Once the bottle is empty, you can fold it up and tuck it awayplus, it includes an integrated trekking pole carry for wherever your adventure takes you. * 17oz Quick Stow flask is lightweight, collapsible and features a one-piece silicone bite valve for rapid hydration * 3D Micro Mesh: Multi-directional air flow and cushioning to maximize comfort and breathability * Reflective detailing for safety * Trekking poles carry for easy removal and access to poles | CamelBak UltraHydration Belt 17oz at Free People in Black/Safety Yellow, Size: M/L