RibRave Alpine Hiking Expedition Backpack Heavy-duty lightweight 600 denier Oxford water resistant material | Four storage compartments with covered zipper closures Internal removable anodized aluminum frame to maintain pack form | Vertically adjustable shoulder harness for an ergonomic fit Waterproof vinyl inner lining inside all compartments of pack | Mesh construction with extra padding on back and shoulder harness maximizes airflow and wicks away moisture Built in ultralight Nylon Ripstop waterproof rain cover | Dual drawstring collar closure enables access to contents through top and bottom of bag Flip top pouch with Molle webbing and compression straps | Molle webbing design on flip top pouch, shoulder straps, and waist belt