I've never actually worn a Timbuk2 so I can't speak for them but the Chrome Citizen 2 is what I have. It's got this second strap that goes under your left arm to stabilize the bag on your back, reflective clip straps. Also, lots of fun colors and patterns! I have a day-glow orange one for visibility 8') The price may seem steep, but it's worth every penny. I could leave my laptop inside it during a downpour with confidence that my laptop would still be dry when I got home.

http://www.chromebagsstore.com/messe...s-citizen.html

Also, yesterday I saw a Salsa Casseroll with full fenders and a sweet rack set up and I salivated.

Eventually, I should get some of the weight off my back. I find that if I ride 30+ miles that day, my shoulders really feel strained from carrying stuff on my back and the aggressive set up of my road bike.