I write two letters a day to our soldiers so I use a lot of envelopes with those and then some write back so those require an answer too. I use more than a box of envelopes a year. These are more convenient for me.
I blew through about $500.00 worth of HP Toner Cartridges before we realized these envelopes were the culprit. The little bit of plastic "quickstrip" that hits the hot part of the toner melts and then your toner leaves a dark vertical line on everything you print. Only it's not the toner cartridges fault - it's THESE ENVELOPES. We lost a lot of money diagnosing the problem.
Great envelopes for a mailing list. Fed easily thru my printer with no jams for over 350 envelopes. Easy to use and seal perfect for security mailings or any other