I picked these up just to U.S. Postal mail some local payments I was too lazy to drop off, I got them due the fact that the Security Tinting ensures the confidentiality, that I demand. I do in fact pay most of my bills this way, maybe I am just hard headed and old fashioned. The peel and stick tabs really appeal to both my wife and myself, the seals also make it easy to let our son help "pay the bills" . We also found them very useful and time saving when sending out our monthly Sunday school flyer's. You never really think about envelopes till you run through a couple of boxes in a single sitting, then you begin to notice details. I like their convenience and price. I would recommend them, and already have to several of the other Sunday school parents with the same monthly responsibilities.