The envelopes close easily and one can print addresses on them from the printer w/ no jamming problem. My only concern is that the sticky part of the seal does not go all the way to the edge of the flap thereby leaving a gap into which the corner of another piece of mail might get stuck or that processing equipment might grab and rip open the letter.
I thought I was buying the security envelopes and these are so thin you can breathe through them. Step up and buy a better one than these! I will next time! My Bad!