Like its big brother, the Gregory Z35-r Backpack is lightweight and features the same rugged, ventilating suspension system. But this 2,135-cubic-inch backpack is ideal for long day hikes or a quick overnighter. Gregorys Jet Stream suspension system allows for air flow so you dont sweat to death underneath your pack, thanks to a perforated frame sheet and a mesh back panel. Aluminum stays provide lightweight but sturdy vertical load support, and scapula and lumbar pads make carrying your gear more comfortable. Both the waist-belt and harness have moisture-wicking mesh to keep you dry underneath your straps. Access your gear through the roll-top lid. Stash anything you want within easy reach, such as a shell or energy bars, in the external pockets or the waist-belt pockets. Water-resistant zippers help keep light precipitation away from your gear. The high-quality ripstop nylon combines durability and low weight.