JanSport Klamath 55 Adventure Series Multi-Purpose Backpack with GridFit nylon GridFit harness plate for on the fly torso length and shoulder width adjustments to conform to the shoulders; adjusts easily when adding clothing or changing terrain Ventech lightweight, highly breathable contoured foam back panel to keep you comfortable and ventilated on the trail Foamex compression suspension board framesheet with dual aluminum stay for comfortable, lightweight weight transfer to the hips Unbound edge, breathable Air Core shoulder strap helps eliminate rubbing and hot spots for comfortable carrying Zippered sleeping bag compartment with drop down divider