We use these for filing - would have to put an extra piece of tape on them if I was using them for mailing just to be sure it wasn't going to come open
I am constantly buying these. THEY ARE EASIER TO USE AND FASTER TO USETHAN THE TRADITIONAL LICK AND SEAL ENVELOPES. I SEND OUT A LOT OF CERTIFICATES NEWSLETTERS AND OTHER RELATED MAILINGS EACH YEAR AND I DON'T LIKE TO LICK ENVELOPES. I DON'T LIKE THE TASTE OF THE GLUE. if YOU'RE LIKE ME STOP LICKING THOSE LICK AND SEAL ENVELOPES. GET THE STAPLES EASY CLOSE ENVELOPES ESPECIALLY IF YOU USE LARGE AMOUNTS OF 9x12 ENVELOPES.