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I think the bottles are sealed.
Water condensates on cool things and the body loses water vapor through pores.
I think the covers on the bottles should mostly prevent that though.
The covers do mostly prevent it. They sometimes do get a little bit of condensation, but it’s not significant. The cover mostly takes care of it. You can get a little condensation near the sealed end of the bottle. It’s less than the amount of moisture you would generate via sweating.