Designed for quick pit stops at aid stations, this HydraPak UltraFlask Speed 500 water bottle shrinks as you drink to minimize sloshing and feels so light you might even forget you brought it.

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Weighing in at just over an ounce, the HydraPak UltraFlask Speed 600 water bottle is so light you might forget you brought it—that is, until you need a quick drink during a long-distance run.

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