Material: 100D Robic HT nylon, 210D Robic HT nylon Volume: 50L (3050cu in) Support/Suspension: Perimeter Suspension (spring steel rod outline, PE sheet core) Shoulder Straps: dual-density, removable sternum strap Waist Belt: Re-Fit (24 - 40in) Granite Gear delivers a fine-tuned design with the Perimeter 50L Backpack for fit-finding perfection. Now with adjustable shoulder width and a daisy-chain torso adjustment, we get a made-for-us fit in two quick and easy steps. As we navigate technical terrain, the periphery frame collaborates with the back panel to give us a stable, dynamic carry.