ALPS Mountaineering Shasta 3600 Internal Frame Pack, Rust Tubular lightweight frame; Top pocket converts to a fanny pack; Rain cover included; Front stretch neoprene pocket Rust, lightweight polyester ripstop; Top loading with extendable top lid; Extra-large lower door access with #10 zipper Adjustable suspension; Rescue whistle buckle on sternum strap; Hydration pocket and port; Internal, horizontal divider; Spindrift collar w/draw cord Lower neoprene side bottle pockets; Side compression straps; Multiple lashing points on front of pack; "Over The Top" compression strap Torso Range: 16 to 20 Inch; Capacity: 3600 cubic Inch/59L; Weight: 5 pounds; SKU 2373805