If you get one of those large diameter mailing tubes and cut it into approriate length you can mail interesting liquids safely.
I packed the bottles in the tubes, with peanuts or popcorn, or foam. Taped the ends and put them into a box of correct depth and filled the space with plastic peanuts.
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jim

"Whensoever the General Government assumes undelegated powers, its acts are unauthoritative, void, and of no force." --Thomas Jefferson