Jansport designed the Whittaker LR Backpack with the help of Peter Whittaker of Rainier Mountaineering. Because of its durability and adjustability, this weeklong pack is the guides choice for summiting Mt. Rainer. Dual-density foam sternum and shoulder straps reduce friction while climbing with a heavy load. The harness plate adjusts easily to fit torso lengths from 17 to 19 inches, and the shoulder width adjusts up to two inches. This internal-frame pack features access at the top as well as the front pocket for quick gear stuffing. The Whittakers soft-form helmet recess offers light protection from falling ice or rocks, and reinforced center compression doubles as a vertical snowboard carry option. Side and internal compression also help keep the pack close to the body and the load manageable.