Gregory Arrio 28 Backpack | Travel Backpack from Gregory | CloudControl Flexible hipbelt provides flexible stable support as you moveVaporSpan tensioned backpanel with engineered mesh for uninhibited airflow and mapped supportBreathable shouder harness with perforated foam and open mesh. Sternum stability strap with integrated safety whistle and hydration hose routing clipTop, quick-access zippered pocket for secure storageTwo pocket organization with large main volume storage and front zippered panel for more organizationDual stretch mesh side pockets with angled access for ease of use and sizes for large format bottlesInternal hydration sleeve with SpeedClip hydration hanger compatible with Gregory's Hydro reservoirs (reservoir not included)Trekking pole system with elastic bungee loop and lower webbing attachmentFront reflective attachment loopsFront fabric stuff pocket with stretch mesh gussets for exterior storageCustom ComfortGrip molded zipper pulls and molded webbing keepers for strap management