Paladineer Hiking Backpack Sport Bag Hydration Pack Cycling Backpack 12L Made of super light nylon fabric,lightweight,durable and water-resistant A large main compartment boasts a hydration sleeve for helping you stay refreshed Air mesh on the shoulder straps adds extra breathability Fully adjustable shoulder straps and torso length to fit a wide variety of people Designed for the trails, cycling, camping, hiking, trips to the gym