Help the USPS, have Google draw them a map

Google Envelopes turns Gmail into snail mail

Here's a concept that couldn't have come together until all the right technological planets aligned, and is still about 25 years late.

The envelope itself would be a Google Maps representation of the quickest route to transfer said message from you to the recipient if roadways and kayaks were used in place of fiber and coax, giving the receiver a crucially awesome keepsake each time you dropped him or her a line.