The compact and agile Lowe Alpine AirZone Active 18 is built for cool, dry comfort on strenuous day hikes. It uses an AirZone LT suspended mesh carry system with fast-wicking hip fins for maximum air circulation, even under heavy loads. Built with a lightweight spring steel frame for efficient load transfer, it provides extra hiking convenience thanks to its quick-stash front pocket, TipGripper walking pole loops, top tensioners, sternum strap and integrated rain cover. Though designed with hill walking and mountain hiking in mind, the hydration-compatible AirZone Active 18 is equally handy for short-haul travel and city trips. In addition to stretch mesh side pockets, useful everyday features include a key clip, a light loop, a zipped security pocket and a highly refined urban aesthetic. The Specifics Volume:18lt / 1100cu.in Weight:0.77kg / 1lb 11oz Back Length:18" / 46cm Dimensions:52 x 27 x 21cm Back System:AirZone™ LT Capacity:18lt / 1100cu.in AirZone LT™ lightweight, breathable suspended mesh carry system Front stash pocket for quick access Hydration compatible-fits 3L bladder Key clip Light loop Rain cover Secure TipGripper walking pole attachments Sternum strap with whistle Stretch water bottle side pockets Side compression straps Zipped top pocket Internal zipped security pocket Zipped main opening