Great for mountain bikers, the redesigned CamelBak174 Lobo153 is aflexible system combining the convenience of external fill with enoughfluids and cargo for several hours of hard trail riding. External fill, OMEGA153 HydroTanium153 Reservoir with Lifetime Warranty Insulation to keep liquid cool for hours Bucklestyle closure for easier removalreplacement of reservoir Lowprofile design won't interfere with helmet Air Director153 back panel with Air Mesh Harness for enha