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  • GU Energy Flask
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GUEnergy Flask

Item # GUS000O

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Item # GUS000O

Fuel yourself in motion.

GU collaborated with Hydrapak to create the Energy Flask, which carries five servings of GU Energy Gel while you run through the neighborhood, bound down the trail, and train in the gym. This soft flask makes your energy-fueling endeavors much easier, as it has a high-flow nozzle and squishes in your hand without much effort. Markings on the backside make it easier to measure your Energy Gel consumption, so you can be sure of your caloric intake while exercising and running. Another neat trick, you can stick it in the fridge to keep your gel cool on sweltering summer days.
  • Soft flask carries five servings of GU Energy Gel
  • Markings on backside for measuring out intake
  • High-flow nozzle for on-the-go consumption
  • Stick it in the fridge to keep gel cool
Tech Specs
Tech Specs
Recommended Use
running, training, trail running
Manufacturer Warranty

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Not perfect

    When you twist the nozzle to get some gel the cap unscrews from the flask. They should have made it with separate right/left hand threads to prevent this. Also when you close the nozzle a bead of gel forms on the opening. Before you can stow the flask you'll be sucking on the nozzle to prevent a sticky mess. Once you get home it's one more thing to wash and dry but I prefer this to the single use packets.

    Works as advertised

    • Familiarity: I've put it through the wringer

    Does what its supposed to do. They will hold more than 5 servings if you fill them all the way up. Perfect for ultras.