A backpack is good for the look 'cause you can't see it when you're wearing it.

Just kidding, I know there's a lot of components to a decision and not everybody has the same priorities or measurements or anything really.

I am struck by the comments about not using panniers because you need to carry your bag once you get there; I got panniers w/ shoulder straps!

I am a big rack/pannier fan, but I am also keeping half an eye open for a messenger bag, in case I do start commuting, once it gets nice out (July? August?) on this road bike I picked up that I don't want to put a rack on... want to keep that sport/racing look!