Fieldline Treeline Day Pack: * 2-liter hydration reservoir attachment (hydration reservoir not included) * Extra-large main compartment with 3/4 zipper opening * Roomy secondary compartment with organizer * Ultra-quiet zipper pulls * Front pocket with zipper closure * Multiple gear-lock attachment points * Yoked shoulder strap system with adjustable sternum slider * Side compression straps to balance packed gear * Left and right elastic mesh pouches perfect for storing water bottles * Deluxe padded back * 1" waist belt for added support