The Mini M.U.L.E® is the ultimate kids hydration pack that lets them carry the essentials when headed out with their parents. This pack has grownup features—1.5 liters of water, a bike tool organizer pocket, zippered compartments for layers and essentials, and reflective strips — in a package that fits younger riders. There’s a built-in whistle for emergencies, and adjustable straps that let the pack grow with kids over the years.