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: The brand new Crux delivers 20% more water per sip, with an ergonomic handle for easier refilling, and an on/off lever that makes it easy to prevent leaks. Breathable air mesh back panel for a lightweight, comfortable fit Reflective accents for visibility in low-light environments Stretch overflow storage compartment lets you easily stash a rain shell or extra layer Safety whistle built into sternum strap Specs: Collection: Bike Activity: Cycling User: Youth Hydration Capacity: 1.5L/50 fl oz Hydration Type: CRUX Reservoir with Standard Exit Port BPA/BPS/BPF Free: Yes Quick Link Disconnect: No Gear Capacity: 1.5L/90 cu in Pack Weight: 210g/7 oz Dimensions: 35.5 x 19 x 19.5 cm / 14 x 7.5 x 7.7 in Fits torso: 30-40cm/12-16 in Back Panel: Padded Mesh Number of exterior pockets: 3