Profile Design HSC 250 Top Tube Mounted Flask with Cage. The HSC 250 is designed for athletes using liquid nutrition the perfect place for concentrated energy allowing other bottles to be used purely for hydration. HSC 250 is a top tube mounted flask that tucks out of the wind behind the stem with a 290ml gel capacity. This system offers a built-in measuring scale that enables riders to track their nutritional intake. The HSC 250 is unique in being designed for modern fueling strategies it is designed to improve aerodynamics while offering a streamlined liquid nutrition solution. The HSC 250 front shell allows cables to route straight through to the top tub keeping the system aero. Mounting is simple and can mount onto most bike by using a direct top tube braze-ons on compatible bikes or using a aftermarket FPS kit. The cage is designed to protect the nozzle from sweat or anything else that drips down to avoid contamination ensuring cleanliness.