Outdoor bag: Get a hydration backpack in black or blue. Versatile bag: Perfect back pack for all outdoor activities. Multiple compartments: Designed with six exterior pockets, you can store all tiny items such as keys, phone, cash. Ergonomic designed: Vest-shaped bag coming with adjustable waist strap and high elastic chest strap. Breathable materials: Made of ultralight elastic nylon cloth, polyester, breathable mesh back and shoulder strap. Water compartment: Holds 2L of water in water compartment. Hydration Back Pack | Black | Living Social