Makes me wonder if being really prepared is keeping a stamped padded mailing envelope in our carry-ons at all times...
Maybe you said that half in jest, half seriously, ... but I'm going to do exactly that. Great idea!
I'm a pretty anally-retentive personality, so the prospects of me accidentally ending up with contraband at a TSA checkpoint are about 1 in 27.3 trillion. But the REST of my family, ... not so much!