To use the Envelope Maker, go here.
You will have to have a PDF reader like Adobe Acrobat Reader installed, as the Envelope Maker creates a PDF.
I have found over the years that securing the cards in the envelope works much better than having a toploader loose. A loose toploader tends to catch in the postal machinery and rip out of the envelope.
Also note that if you are using more cards that can fit in a toploader (about 4 if you are careful), the thickness is such that you should probably use a bubble mailer.
If you have any feedback, praise, or suggestions about the mailer, you can contact the author at (who is also the author of the Imperial Auction Block):