I wanted a return address printed in the top left. My printer had trouble with the envelopes feeding. He had some in stock and used those. He thought maybe the ones I gave him were old but I had ordered them specially for this so if they are old they were old when they were delivered. I don't know if that was the issue. That being said I used these before. It saves having to make separate labels to stick on envelopes. I can just fold the letters and have the address show through the window. They also seal fine.