This is the first time I've bought bottles with one way valve from this company. I've bought other bottles from this company with no problem, but again they didn't have a one-way valve. The quality of one-way valve bottles is lower than other bottles. They are thinner (softer plastic) and the lids are difficult to tighten. On one of the two bottles I received I was unable to fully close the lid (see picture) which rendered it unusable. A more accurate comparison between the one-way valve design (red bottle) and the pop-up cap (grey bottle) is the number of steps required to unscrew the cap (see image). The top cap is squarer, more stable and easy to unscrew. The bottle with one-way valve has a screw-on thread, it is difficult to align and requires a lot of force to screw it all the way in to prevent leakage. Like others, I prefer the one-way valve design. If they can't make a one-way valve cap that works with a flip-top bottle, I wouldn't buy a one-way valve bottle from this company.
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