Stay on pace with the Arrio 24, the ideal day hiker's toolkit. A lightweight daypack, the Arrio 24 delivers cooling airflow with an off-the-back mesh backpanel, and stretchy CloudControl hipbelt. Equipped with an internal hydration sleeve and dual stretch-mesh side pockets for easy access to extra water. This extended size leaves space for a longer hike, staples, summit sandwich that you definitely earned. CloudControl Flexible hipbelt provides flexible stable support as you move VaporSpan tensioned backpanel with engineered mesh for uninhibited airflow and mapped support Breathable shouder harness with perforated foam and open mesh. Sternum stability strap with integrated safety whistle and hydration hose routing clip Top, quick-access zippered pocket for secure storage Dual stretch mesh side pockets with angled access for ease of use and sizes for large format bottles Internal 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 attachment Front reflective attachment loops Front fabric stuff pocket with stretch mesh gussets for exterior storage Custom ComfortGrip molded zipper pulls and molded webbing keepers for strap management