December 29, 2012 12:07 PM Subscribe
What's that perforated part on the back of an envelope for?
posted by devnull to grab bag (9 answers total)
Often on the back of an envelope with a horizontal flap, there is a detachable perforated part separate from the sticky bit. What's it for? Should I remove it before sending?
It kind of looks like this deep flap envelope
, but the detachable part is far, far smaller.