KIDS BIKING HYDRATION PACK: CamelBak Kids Mini M.U.L.E. Pack is small enough for kids to carry 1.5L of water. It s lightweight with a built-in safety whistle, extra storage pockets, and reflective accents for visibility in low-light environments.. MORE WATER PER SIP: Crux reservoir delivers 20% more water per sip, with an ergonomic handle for easier refilling, and an on/off lever that makes preventing leaks simple. The kid-friendly and easy to use on/off switch supplies the water kids need.. COMFORTABLE & FUNCTIONAL BACKPACK: Mini M.U.L.E. hydration backpack has a bike tool organizer pocket, a breathable mesh back panel for a cool & comfortable ride, and a stretch overflow pocket perfect for stashing a rain shell or extra layer.. KID-FRIENDLY SIZING: This pack has grownup features in a package that fits younger explorers. Our reflective strips and safety whistle make kids easy to spot on the trail. This kid s backpack for hydration will keep your littles hydrated and happy.