Cap solution. Well I recently bought them for alcohol shots. I notice a lot of complaints about caps. But I also noticed that some people didn't complain. So I took a risk that it's not a problem. And caps are a HUGE PROBLEM. You don't stay. Maybe about 1 out of 10. After trying to force them, it took me a few minutes to think about the issue. They come loose because the tabs used to close the caps are too tight and as soon as you push down they slowly start to lift. As a result, the peak does not remain for an appreciable amount of time. So the problem is the pressure. So I cut off a bit of the bottom lip to take the pressure off. I then made some cuts on the top bar to relieve the pressure. This kept the lid sealed with liquid, but was unable to build up enough pressure to pop out. Each cap takes about 5 seconds, but if the cap is as important to you as it is to me, it was worth it. A week has passed and the caps are still being put on with no problems. The factory really needs to do this on their side and deliver a product that works. But since it was cheap I won't complain. Product 5 stars minus 1 star for faulty cases.
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