Jiffy bag
noun
1.
trademark a thickly padded but light envelope in which articles such as books are placed for protection in the post
Slang definitions & phrases for
jiffy bag
jiffy bag
noun phrase
A small canvas or leather bag for carrying toilet articles, etc, while traveling
(WWII armed forces)
(also Jiffy, a trademark) A heavy-walled paper bag used for mailing items, esp books
(1970+)