i was told by airline folks
to leave it in the original unopened, packaging
and in a big ziplok bags, just incase
pressure causes it to explode
( i had castille soap blow up years ago, and it was no fun, smelled nice and minty thought ) ...
but things might have changed in a year's time
why don't you and call the faa or airline you are flying ?
better to call and find out from the source than
get advice from people who mean well, but may not have the latest info ...