Definitions by Wordmaiden

donotbendelope 

Stiff, usually cardboard-backed envelope used for sending thin, and often valuable, items such as certificates and photographs that need to be protected from damage. These envelopes are usually embellished with the words "Do Not Bend". Synonyms: do not bend envelope, board-backed envelope.

They posted my diploma in a donotbendelope and it arrived in pristine condition.

donotbendelope by Wordmaiden March 28, 2017