Lowe Alpine Airzone Active 18-M One Size 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 compact and agile Lowe Alpine AirZone Active 18 is built for cool, dry comfort on strenuous day hikes.Zipped top pocketInternal zipped security pocketZipped main openingSide compression strapsStretch water bottle side pocketsAirZone LT™ lightweight, breathable suspended mesh carry systemFront stash pocket for quick accessHydration compatible-fits 3L bladderKey clipLight loopRain coverSecure TipGripper walking pole attachmentsSternum strap with whistleHiking AirZone Back SystemWeight : 0.77kgVolume : 18 LitresBack Length : 46cm