Aerodynamic hydration system developed to make hydration easier and more aerodynamic. Wind tunnel testing shows bikes have LESS DRAG WITH SPEEDFIL than without! Mounts on the down tube of any road or triathlon bike. Mounts directly to standard bottle mounts. Includes cage, mounting hardware, 40oz. areo bottle, tubing, bite valve, and Speedfil cap. Also available: optional Speedsok bottle cover, which helps keep liquids cold longer. [For mounting Speedfil on seat tube, add the seat tube adapter kit]. Bottle and Cage specifications: Length: 12"(+/-) Width:2"(+/-) Height:9"(+/-) Volume: 40oz. (+/-) Weight: 298g (+/-) empty Material: Bottle and Parts = Polyethylene Plastic Cage: 15% Glass Fiber Reinforced Nylon