Go hands free The Mountainsmith Dart II hydration waistpack keeps your water bottle close by so you can focus on your run, not on carrying your bottle. Durable recycled nylon and PET fabric is backed by an air-mesh foam back panel that ventilates during high-octane workouts. Foam insulated water bottle pocket fits 22 oz. water bottle included bottle features sport cap for easy, on-the-go drinking. Zippered mesh pocket with key clip easily fits keys, ID and other small essentials. Reflective detailing increases your visibility in low light. Closeout.