I always complain about how long it takes to get mail delivered to someone, so thought I could speed it up if I show the USPS the way to get it there *LOL*
This is the envelope I made for a card I sent off to Pam (couldn't wait for her to get it so I could put this on my blog).
It took some trial and error to figure out the best way to do it. I started out printing on an 8.5 x 11 paper then making that into an envelope, but that was limited to an A2 size card (4.25 x 5.5). I wanted an envie for an A6 card so I played with Publisher and that did the job.
I am not an expert at using Publisher, this is just what worked for me. There are probably other ways to do the same thing.
First you get your route in google maps and take a screen shot of the map (try to allow for return address and stamp at the top, and you need to put a white text box for the mailing address so you don't tick off the Post Office) so keep the route line out of that area too. Save the screenshot.
In Publisher open a blank envie close to the size your want... then you can edit the dimensions to 6.5 x 4.75.
Use the Insert Picture button to add you map. Don't worry that it doesn't fit exactly yet.
With the map selected, right click on the Insert Picture button and select "Measurement" and change the size to 6.5 x 4.75 and it will fill your envelope blank.
With the text box selected, go to the "Format" menu at the top and select "Text box". Change the fill color to white, and TA DA you are ready to print on your envelope.
Follow your printer instructions to load your envelope and print the map on it.