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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