I kinda like this one from Prada FW 2010. But I'd probably like it more if the camouflage print were a little smaller.
The Gucci Darwin bag from SS 09, seen here on Rihanna, is pretty nice as well. A friend has one and it's pretty roomy. Another great thing about is you can convert it into a hobo.
It's interesting this backpack on Kanye West. It's Louis Vuitton, a backpack, and in Damier Azur?? You're probably wondering why you've never seen it in stores. I read somewhere he had it custom-made. Holy moley. Maybe someday i can have something custom-made as well. Now which politcian do I hafta kidnap to get that kind of money. LOL LOL LOL