This is where I found http://www.dealextreme.com/. Its's this online shop based out of Hong Kong. The real kicker is that they ship stuff you buy from the site anywhere in the world for FREE. Gravy.
Search the site for a "laptop backpack" and browsed the results. I finally settled on this Waterproof 15.4" Travel backpack. I stupidly thought that the brand is Waterproof. Hehehe. When I got my backpack after 4 weeks, the brand is Swissgear. Just its made in China which probably makes it a knockoff. But don't let that put you off because honestly I can't tell it apart from the original. The backpack seems to be well made.
I also need to mention this...it has this cool feature where a special small bag designed to load CD/MP3/MP4 players (ie. an iPod) with 3.5mm cable and jack allowing you to enjoy music at anytime. The interface jack is on the harness. But I think you have to get one of those headphones with controllers so you don't have to dig through the pack.
My best purchase ever!