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I was skeptical at first, but after seeing EVERYBODY using these at races I decided to try them & I'm in LOVE! No more hydration backpack, I'm all about these bottles now! They NEVER slosh (provided you suck all the air out in your first sip) or flop around, and I love that they don't take up space once you've drained them. So easy to throw some extras in the pack for a long run and swap out the empties in the running vest as you go. Maria on Sep 7th 2017
The U.D. trail running vets I bought came with hard plastic water bottles, what were they thinking???
I replaced both with these collapsible bottles, much better! Unknown on Jun 6th 2017
Got 2 of these bottles with a vest I purchased. They do there job well. only complaints are that I'm still getting a strange taste form the bottle even after rinsing the bottle out 50+ times. I've even left them over night full of water and then done several water changes left them again and repeated the process several times and still the weird tastes persist.
The screw cap seals the bottle well just be careful when screwing it up as the threads on the cap don't engage that well with the bottle and I can see some people cross threading it. the bitey valve also works well and is removable which allows easy cleaning if you wish to do so. When all the water is gone the bottle collapses down to virtually nothing and takes up minimal room.
overall pretty good bottle just a shame about the taste. Simon on May 13th 2017