None. That does not work. We have a few that are similar in design but without the extra element in the neck of the bottle. I thought maybe they were actually hermetic. If you fill the bottle and just leave it alone, don't open it and just leave it on the counter, then it's airtight. However, upon unpacking after the flight, I found that my soap had actually leaked from the bottle and it was sealed. Luckily I remembered to put the bottle of my face oil in a plastic bag in my toiletry bag because that leaked too and would be worse than soap.
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