The key to the supremely comfortable carry of the Gregory Z35 is the dynamic Cross Flo suspension system. The fully breathable harness provides full back ventilation without sacrificing load carrying capabilities. The sprung trampoline back panel automatically tensions as you add load to the pack making it extremely stable under load whilst maintaining maximum air flow. The shoulder straps & the hip belt are constructed from perforated foam to further enhance breathability & decrease weight; in fact the Z35 is substantially lighter than its predecessor. Access to the main compartment is either through a traditional top loading lid or through a large U zip front panel that means that you can access the contents like a duffel bag. The top lid itself is fully floating allowing extra storage if required & features a zipped pocket. Other pockets include a front stash pocket, waist belt pockets & side stretch water bottle pockets. Twin side compression straps keep the load centralised & balanced & there are attachment points for trekking poles & ice axes. An integrated rain cover provides waterproof protection & is simple & straightforward to attach. We are all massive fans of Gregory packs, & our admiration stems from the fact that they provide the best carrying comfort & offer high quality construction. Updated Cross Flo Suspension System Ventilated EVA foam on hip belt & shoulder harnesses Top-loading main compartment with quick-draw top closure & full-body front U-zipper access Floating, removable top pocket with zippered pocket & key clip Under-lid zippered stash pocket Front bucket pocket for quick gear storage Two external stretch water bottle pockets Dual quick-access waist belt pockets Interior hydration sleeve with hose port Hideaway ice axe/trekking pole loops Side & bottom compression straps Quick-attach, integrated color-matched rain cover Materials – 210D robic dynagin, 100D robic GR shadowbox, 200D polyester oxford, 265g polyester stretch woven & 190T nylon taffeta