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Earplugs are usually not 100% vacuum sealed. Even if you have custom-made ones that more or less seal (I have 2 pairs) they usually still lose the seal a bit occasionally. Certainly when you swallo...
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Earplugs are usually not 100% vacuum sealed. Even if you have custom-made ones that more or less seal (I have 2 pairs) they usually still lose the seal a bit occasionally. Certainly when you swallo...