Take on anything with the Arrio 18, from a quick trail rendezvous to all-day adventures. The ventilated suspension and breathable shoulder straps keep you cool, and all your essentials are at your fingertips with the streamlined organization.. . . . . FreeSpan suspended open-air mesh backpanel keeps you cool and comfortable on the trail. Top loading access with secure drawstring closure. Perforated, breathable shoulder harness with built-in hydration routing and sternum strap with integrated safety whistle. Internal hydration sleeve with SpeedClip hydration hanger compatible with our QuickDry 3D Hydro Reservoir (reservoir not included). Front bungee system with reflective webbing loops. Top zippered quick-access pocket. Swing around, side zippered stash pocket for quick storage and key clip attachment. Side stretch mesh pocket. Custom ComfortGrip molded zipper pulls. Activity: Day Hiking. Internal Frame . Frame Type: Perimeter wire. Suspension Technology: FreeSpan. Compartment Access: Top. Closure Type: Drawcord. Number of External Pockets: 3. Hydration Compatible . Fits Torso: 16" - 21" / 40.6 - 53.3cm. Weight: 1.39 lbs / 630.5 g. Volume: 18 L / 1098.4 cu in.. Max Carry Weight: 15 lbs / 6.8 kg. Packed Dimensions: 20.5" x 10.6" x 6.7" / 52 x 27 x 17 cm. External Material: 100% Nylon. Frame Material: Alloy Steel Frame. Frame Material: Alloy Steel Frame. Pack Body: 210D Honeycomb CryptoRip HD Nylon with PFC-Free DWR. Pack Bottom: 420D High Density Nylon with PFC-Free DWR. Lining: 40% Post-consumer Recycled 135D Polyester with PFC-Free DWR. Suspension: Alloy Perimeter Frame & Open Mesh. Imported.