Fieldline Pro Series Womens Treeline Backpack Extra large main compartment with 3/4 zipper opening Deluxe padded back Equipped with Gear-Lock Modular Locking System, ultra quiet zipper pulls, side compression straps, elastic mesh pouches, and a 1 inch waist belt 2-Liter hydration reservoir compatible (hydration reservoir not included) Roomy secondary compartment with organizer