This pack has grownup features – 1.5 liters of water, a bike tool organizer pocket, and zippered compartments for layers and essentials – in a package that fits younger explorers. We’ve also added reflective strips and a safety whistle to make kids easy to spot on the trail. Features Reflective accents for visibility in low-light environments Breathable air mesh back panel for a lightweight, comfortable fit Safety whistle included on sternum strap Secure zippered pocket for essentials Lightweight, ventilated mesh harness Bike tool organizer pocket keeps supplies safely stored and easily accessible SpecificationsUser Group Youth BPA/BPS/BPF Free true Dimensions 13.78 x 8.46 x 3.94 in / 35 x 21.5 x 10 cm Material Polyester Weight 7 oz. / 210 gm Back Panel Padded Mesh Quick Link No Waist Belt No Pack Weight 210g/7 oz Hydration Type Included: Crux 1.5L Reservoir with Standard Exit Port Torso Fit Range 12" – 16" Gear Capacity 1.5L Hydration Capacity 51 oz. / 1.5 L Exterior Pockets 3 Gear Range Minimal