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.Key Features: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.. Specification: Total Capacity: 3L, Gear Capacity Only: 1.5L, Reservoir Only: 1.5L.