CamelBak: 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.PACK ONLY WEIGHT: 210g / 0 lb 7 ozTORSO FIT RANGE:30-40cm / 12-16 inFABRIC: 200D Polyester Plain Weave / 210D Nylon Plain WeaveFEATURES:• 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.