Gregory Arrio 24 Hiking Daypack - Ventilated Trail Pack for Day Hikes & Outdoor Adventures Some backpacks can't wait to get out of the house — and the Gregory Arrio 24 is one of them. Built for hiking, touring, jogging, and everything in between, the Arrio 24 pairs a ventilated FreeSpan mesh backpanel with multiple quick-access pockets and a built-in hydration system for all-day comfort on the trail. Whether you're hitting a local Calgary trail or heading into the backcountry, this versatile hiking daypack keeps you cool, organized, and ready to move. VaporSpan tensioned mesh backpanel with engineered airflow channels and mapped support keeps your back cool and ventilated on hot summer hikes CloudControl flexible hipbelt moves and flexes with your body for stable, comfortable support on uneven terrain without restricting natural movement Breathable shoulder harness with perforated foam and open mesh construction, plus sternum strap with integrated safety whistle and hydration hose routing clip Large main compartment with front zippered panel pocket for two-zone organization of hiking essentials, layers, and trail snacks Quick-access top zippered pocket for secure, fast reach to keys, wallet, phone, and trail essentials Dual angled stretch mesh side pockets sized for large water bottles and hydration flasks — accessible without removing the pack Internal hydration sleeve with SpeedClip hanger compatible with Gregory Hydro reservoirs for hands-free trail hydration (reservoir not included) Front fabric stuff pocket with stretch mesh gussets for wet layers, a rain jacket, or extra gear Trekking pole attachment system with elastic bungee loop and lower webbing for secure pole carry on technical terrain Front reflective attachment loops for low-light visibility and gear attachment Custom ComfortGrip molded zipper pulls and webbing keepers for clean, snag-free strap management