Naked® Running Flask - 500mL.

5 reviews Write a Review
FLASK 500ml
Due to a delay with our flask shipment, flask orders will not ship until approximately 6/10/21.
5 customers are viewing this product

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

*Vest Shown in Picture Not Included

? Have Questions? Ask an Expert

Naked® Running Flask - 500mL.


Customer Reviews

5 Reviews
  • 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.

  • Running Flask

    Posted by Helle Leap on Apr 28th 2020

    LOVE the flask. It goes perfectly with the Naked Belt. Enables me to carry water and the flask just collapses as you drink. No bulky bottles. Love it.

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