Well, this was inevitable. When Steve Jobs dramatically presented the MacBook Air by removing it from a manila envelope, two enterprising artists saw an opportunity, and the result is AirMail.
It's a vinyl laptop sleeve for the MacBook Air that looks just like -- you guessed it -- a standard issue manila envelope. They're lined with fleece and even feature a tie enclosure. Each hand made bag costs $29.95US, and they begin shipping two weeks from today.
It's not the most durable bag available, but among the most clever.