Backpack in Atlanta SUCKS. Makes you sweat like nothing else. Pack gets the stink after a while as well.

I use a Topeak Explorer rack and a MTX trunk bag. It has fold out panniers if the wife gives a "on your way home" call. I have as yet used them in 2 months of having this bag. The trunk portion has been fine for lunch, Sunglasses, Towel, Lights etc.

Now I have had some issues where I wish I had gone with a Pannier like the Novara Commuter or Arkel Commuter and a Wald fold out on the other side. That would leave the top of the rack open so my Kids We Ride can be connected but I still have a bag for snacks tools etc or if I need to carry leftovers from lunch home the top of the rack would be free(that need to be upright because of the container). It would also allow me to carry my laptop when needed and haul a LOT more then the Topeak MTX carries for the "on your way home" calls.