I use these for business mailings. I had a name/address stamp made (also at Staples) and use that for my return address. I then print my customer's info on address labels and have a high quality professional appearance for pennies per envelope.
I love pull-tab envelopes. They're more expensive but very easy to use. I didn't want to buy 100 envelopes but it was the better value. I'm always searching for the best price between office supply stores but I was in a hurry and needed the envelopes so I didn't sale shop this time.
The envelopes are sturdy enough so unlike other brands they don't come apart at the seams. BUT the self-seal works well in the center and nearly to each edge - and then it doesn't stick. I asked my postmistress about this and she said the edges need to be taped down so they don't get caught and ripped in the P.O. machines. Good stick-um at edges would vastly improve this product!