The HydraPak SoftFlask Speed 500mL is lightweight with a pliable vest-specific construction so that runners can attack their runs without being weighed down, or impinged. The flask can also be easily packed away, or tucked into a pocket, thanks to its compact, flexible design. Further, the HydraPak SoftFlask Speed features a SpeedFill cap with flip top that allows for quick and easy refills at aid stations. The self-sealing bite valve is spill-proof, ensuring that there are no annoying drips while running. Runners can also customize their hydration experience with the choice of a bite valve top, or an included straw drink tube, which can be easily changed to meet your needs and the demands of the run.