Naked® Running Flask - 500mL.

4 reviews Write a Review
500ml SOFTFLASK Packaged
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With our new 500ml soft flask – Made by Hydrapak – you get even more world class performance out of your hydration system. Designed to maximize the ergonomics in our running vests, the low profile flask with 28mm cap and high flow bite valve shrinks as you consume your liquids reducing it’s mass and volume. Weighing a scant 28g. it is the perfect companion for all ultralight Naked products.

Run with confidence knowing our flasks come with Hydrapak’s famous Beyond Lifetime Guarantee.



  • 100% BPA and PVC free
  • Weighs 28g
  • Low profile
  • Shrinks as liquids are consumed


A little TLC and your Naked® soft flask by Hydrapak, will serve you for a long time.

Remember to:

  • Hand wash or place on the dishwasher top rack
  • Use +60C / 140F water temperature
  • Keep cap placed on when not in use
  • Keep out of direct sun for extended periods of time
  • Bottle Bright always helps keep your flask smelling and tasting fresh
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Naked® Running Flask - 500mL.


Customer Reviews

4 Reviews
  • Very happy

    Posted by Sam O on Aug 26th 2020

    Fit nicely in Naked belt. Didn't leak. Easy to drink from while running - the bite valve and soft structure made it easy to drink with no worries about sloshing or air getting in my mouth. Was easy to get every drop of water out while running.

  • Better than standard flasks

    Posted by Chris Pauls on Jul 15th 2020

    I own a Naked Innovations Vest, which I LOVE! It came with two flasks, and they are much more comfortable than standard flasks with a wider opening, so I decided to order two more for longer unsupported runs. These work great and don't irritate me after being pushed against my body for several hours. The vest and belt are awesome, too!!

  • Good, and makes sense

    Posted by Tom B on Jul 15th 2020

    These flasks aren't quite *round*, which makes sense when you put them in the vest (or band probably) since as they can sit a bit flatter. My main complaint with these is the narrow opening. If you did make this a wider-mouth opening, the shape of the flask would have to change a bit, and that might alter how well they fit in the vest (or band). With all soft flasks, I find that the smaller opening bottles are just a bit more difficult, both to ensure are properly sealed as well as to fill (especially if you want to put some dry powder mix in, you have to rig up a funnel or be very careful). So, I my rating reflects this design decision, given that decision, I think these bottles are well made and work well in their vest.

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