Tailwind Nutrition 500ml Soft Flask

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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.


  • 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

54 Reviews Hide Reviews Show Reviews

  • 5
    My new favourite bottles

    Posted by Steve Grout on 10th Feb 2018

    Love these bottles - seem to rectify all the issues I had with others I've used: the wide top means I don't spill half my tailwind powder on the floor; the caps screw on tight meaning the caps don't leak; the material is strong enough that they don't suddenly spring a leak between the top/side half way through a run. So far, no down sides.

  • 5

    Posted by Michael Unsworth on 31st Jan 2018

    Great bottle that reduces in size as you drink. Fits nicely into running vest chest pocket and easy to hydrate on long runs.

  • 5
    Great little bottle

    Posted by Claire Sparrey on 17th Jan 2018

    This bottle works really well. I'm currently training for a few marathons coming up in the spring. On my longer runs I use a 1.5 litre camel bak with 4 scoops if Tailwind, this is perfect for a 20 mile run and I've usually run out by then. Instead of buying a bigger camel bak I bought this little bottle so I could fill it with a higher concentration of Tailwind which gives me an extra boost to push through the last few miles. It works perfectly and fits very nicely into my camel bak. Would highly recommend. Also great for taking on shorter runs too.

  • 5
    Perfect for trail running

    Posted by Anthony Dixon-Gough on 12th Jan 2018

    Great flask that collapses as you drink to stop the fluid sloshing around.

  • 5
    Soft bottle

    Posted by Richard Broughton on 18th Dec 2017

    Good size bottle with a well made valve .<br />Folds up so takes up less space when empty in my back pack.

  • 5
    Very useful

    Posted by Damien Holloway on 17th Dec 2017

    Really useful drinks carrier.