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The Speedfil F1 uses a wind-tunnel-developed design to provide 40 ounces of hydration capacity. The system mounts to a standard water bottle cage mount on the downtube of a bike frame, with a long straw then routed up to the athlete for easy, hands-free drinking while in the aero position. The F1 is also refillable on the fly, with a splash resistant opening that is easily accessible while riding. In addition to providing easy access to hydration, the F1 also fills in much of the empty space inside a bicycle’s main triangle, which can help to smooth airflow around the frame and improve aerodynamics.