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I used these bottles during a recent marathon because they met the race regulations for holding 1 L of water or less. Unfortunately I had one heck of a time trying to get fluid out of these bottles and ended up finishing with almost two full bottles on a very HOT day. The plastic isn’t pliable enough and the bite valve is next to impossible to pull out and drink from. I coughed at least once or twice during my run because I was sucking air. Runners don’t have time and capacity to take a long pull on a water bottle. Fluid should easily come out of a bottle with little to no effort and quickly. I think this product has potential if Ultimate Directions makes some changes but otherwise I don’t recommend using these. Athletes shouldn’t have to work so hard to get water out of a bottle. Unknown on Apr 26th 2017
Bottle has a good hand feel conforms to had better than the old bottle. Valve is hard to open out of box but after a couple runs its perfect. I used in my vest and much more comfortable than the old bottle great chest feel. Robert L on Jan 18th 2017