The CamelBak Mini M.U.L.E. 50 Oz Hydration Pack - Youth is a hydration pack for biking. As your kid grows, they'll be adding Medium to Ultra Long Endeavors to their mountain bike resume with you by their side and this pack on their back. The included Crux 1.5L Reservoir keeps them hydrated while they're on the move, learning and improving on their skills. Inside the pack, there is plenty of space for bike tools, snacks, and a few more necessary essentials.