Medium black/yellow/black timbuk2 right shoulder. Got it on discount from the bikeshop that was in the same building as where i worked when i started biking six years ago.
Stole a Red/black Chrome Citizen from my wife and started using it when she had to start driving to work and i had to carry more crap. it's bigger and nicer but it's left shoulder ><
i'm not even left handed but i perfer to dig in my bag on that side...

edit: oh yeah. i also stole my wife's chrome because she lost the stabilizing strap on my bag...