I have the HD multifit overnight bag which mounts over the back rest and sits on the rack. It will hold a change of clothes, laptop, toiletries, and lunch and not much else but works well. Got it on ebay.
I have Fox Creek Fatboy bags on my Fatty and I think it looks fine. I plan to modify them so that they can strap to the struts, sit lower and so that I can run a solo bag most of the time. I barely ever use the exhaust-side bag.
ya well i guess there politeness is looked at as discurigment to others i want nothing more then to have a happy fellow biker and i showed him pics let him decide what h wants for his bike telling him bags ant for fat boys is like telling me i cant take my bike out on saturdays oh ya i see an *** woopin for that