The #7709 Hydration Pack is constructed of 1000 denier nylon with heavy-duty zippers and hardware. It has one large main compartment with separate hydration compartment and tube routing. On the front are two zippered cargo pockets with drainage. Outside are MOLLE loops for attaching accessory pouches. Comes with 2 liter (70 oz.) reservoir. (Includes reservoir, insulated tube and bite valve)The back has a mesh-vented panel with heavy padding and s-shaped backpack straps with quick-release sternum strap.