The lightweight Gregory Z 55 Backpack holds all the gear you need for a day at the crags, an overnight backpacking trip, or a longer ultralight backpacking adventure. The Z 55 comfortably carries about 35 pounds of gear and weighs less than four pounds. Gregory gave this backpack its Jet Stream suspension system, which includes a perforated frame sheet and a mesh back panel in order to promote ventilation. Padding in the lumbar region and at the shoulder blades makes carrying your load more comfortable. Aluminum stays give you lightweight vertical load support. The padded harness and waist-belt feature moisture-wicking mesh, so you won't get all sweaty underneath your pack. Get into your pack from the top or the side, and load items you want quick access to—such as snacks, your camera, and a shell—in the external pockets or your waist-belt pockets. Gregory made the Z 55 with high-quality nylon for an ideal combination of strength and low weight.