With the CamelBak Kids' Mini M.U.L.E.® 50 oz. Hydration Pack, even the youngest cyclist can head out for a fun ride with the rest of the family. The 200D polyester plain weave and 210D nylon plain weave materials stand up to plenty of use, while the bike tool organizer pocket and multiple compartments — including a stretch overflow storage compartment for a shell or extra layer — keep essentials organized and handy.