retail therapy :)
http://www.timbuk2.com/tb2/products/sale/espresso-messenger-sale-50
I just bought this bag! I've been waiting for it to go on sale since March!! I think the small size is a good fit for me, since I'm not super into carrying a bag all the time with all my life possessions in it... but to bring a water bottle, book, notebook and whatever else I happen to need, I think this will do the trick! :)