So I bought the large solid black one.  I guess out of the colors available it was the less annoying.  (Consequently it also makes me a perfect communist (CONFORM) that and my penchant for Run and Cokes.)  The bag is not that big.  I have my bike stuff, tool kit, patch kit, and bike lock.  My gym clothes, work clothes, one 15inch Dell Inspiron a.k.a. "The Beast", and a pair of shoes.  I could have really used the XL in hindsight.  No matter how I make the strap it finds a way to dig, but so what.  It's sturdy enough, and if you check the market, the cheaper of the bags on the market, if you can freaking believe that, what a racket.

So it works, but it's hard to get into.  Always looking for my keys or garage door opener.  My fault I'm sure, I should just put them somewhere I can get to easier.

So buy it, but if you seriously commute you will need the XL bag me thinks.

Oh and unrelated to Timbuk 2 Amazon took FOREVER to ship this bag.  Sheesh.  Like a month.