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Tailwind Nutrition Soft Flask

But don't take our word for it, read the reviews

  • 5
    Best Soft flask on the Market

    Posted by Seth Bearden on 23rd Nov 2019

    I use this flask for all my adventures. It is perfect for handheld or placing in a hydration vest pocket. The lid threads on easily and is simple to fill. I use these exclusively! Thanks UD!

  • 5
    Great flask

    Posted by Heather George on 9th Oct 2019

    Very convenient to carry. Hand carried during marathon and very easy to drink from. Wide opening made it simple to fill.

  • 4
    Good soft flask

    Posted by Unknown on 15th May 2019

    I have bought two of these recently. One developed a pinhole leak almost immediately. I don't know if it was faulty or something happened but it is disappointing. The other one is great and served me well during my last ultra.

Tailwind Nutrition Soft Flask


Hydrapak's UltraFlasks™ are designed to conform to the shape of your body, compressing as you drink. This means reduced sloshing and bouncing, less spillage and an easier time sucking out that Tailwind goodness.

The flexibility of the soft flask means it can fit into your existing gear: successfully tested with Ultimate Direction, Salomon and Nathan vests as well as countless bicycle jerseys and backpacks.


  • Clear Plastic - no more guesswork towards the amount of Tailwind left
  • Collapsible - Perfect bottle to use on multi-stage events or international events, it's only as large as the Tailwind being carried
  • Lightweight - weighing in at just 38g once emptied the flask is light as a feather
  • Pliable - Conforms to any shape, be it your hand, belt or high-tech vest

Dimensions: The hard plastic top of the flask measures in at 8.5 x 6.5cm wide and stands 7cm with the rest of the flask being able to collapse in to the hard top when empty. Holds up to 500ml/17oz.


Our promise to you

Take the Tailwind Challenge

Try us at your next race.

Choose 4 bags and start training.
If you aren't satisfied, we'll pay your entry fee.*

*Entry fee reimbursement is limited to $150 maximum, and you must start the event to be eligible for reimbursement.