I have 2 different 'brand' bottles that I fill and need replacement caps: Sparkletts and Primo. These caps fit Sparkletts bottles very well and I haven't had any leaks. BUT they are difficult to remove from the bottle when needed. They are much easier to remove from Primo bottles. BUT they don't close completely and if I put them on their side during shipping I get a little leak when I put them upright again. For the price and the amount you get ($8 for 12 when you buy) I still think they're worth it which is why they get 4 stars. If very little water bothers you, you can probably just wrap the tops in a towel during transport to soak them up.
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