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