Lightweight and compact, the Hydrapak's UltraFlasks™ collapse as you drink. This eliminates sloshing and allows you to pack the empty flask tightly to stow on the go. Perfect for integrating into hydration vests, belts, or handheld systems. Suited for a full range of year round activities, and backed by Hydrapak's leakproof warranty. 500ml/17oz
I use this for mtn biking. I put in my back jersey pocket. Much better then the hard bottles.
My running buddy had been wanting to try a soft flask for a while, so I got him this one for Christmas as part of a runner basket full of goodies. I was more than a little jealous when I received the package, so I'll probably be getting one for myself soon. :)
Men, why run with moobs (hard plastic bottles in the front breast pouches of your running vest)? I suspect the ladies as well will see the inherent value of this technology. This is the coolest invention in some time. Super quality, easy-to-use, don't-have-to-think, hi-tech bite valve, and the collapsible flask is simply brilliant. Really encourages you to run further/drop bulk with every sip. Might buy a dozen of these things, they are awesome!
Love it!!! I have stuck it under my running belt for more water and when that water is gone it fits nicely in the front bag.
I have biked with it. Put it in my biking shirt and it was easy to get to. Then once you start drinking its simple to hold onto without feeling awkward. I am heading this weekend to bike a Century and excited to really put this to the test. Tailwind products are hands down the best.
I am loving the UltraFlask! It's a great addition to my fuel belt. I can easily tuck it in the belt for an extra 17oz. of Tailwind goodness ♡ And the fact that it collapses on itself as you drink helps to store it away when empty. Need to purchase another as both my husband and I like to use it.