The New Balance Hydration Backpack is made from ripstop fabric featuring reflective details for visibility and water-resistant materials to keep your items dry. The backpack includes 100% nylon shell, 100% polyester lining, and H2O bladder for hydration on the go. It has a 24" - 36" adjustable mesh waist belt, bungee cord system, and sternum strap for a secure customizable fit and its lightweight at just 1 pound.