The CamelBak M.U.L.E. holds up to 3 liters of water, which is enough for three or more hours of biking. The pack comes with a lifetime guarantee and plenty of storage space for a helmet, multi-tool, and other necessary items. A removable belt and sternum strap provide security, while an Air Director(TM) back panel facilitates ventilation and comfort. The M.U.L.E. also has an easy-to-clean wide-mouth opening and a low profile design. It has an easily opened water storage turn cap and center baffling.