Reseal

The easy and practical "wine cork" is used to "reseal" a wine bottle by sucking out air from the bottle and creating a vacuum.

My CIA file included two first class letters written by me on Liberation News Service stationery and addressed to Moscow. […] I cannot tell from the xerox copies sent to me if the letters were opened at the CIA and the re-sealed and sent out, or if the CIA merely stole them from the mail. Neither letter ever received a response, as far as I can recall.