I usually run 12 or 14's... If I am running bags of death for stupid Lake E fish I'll use an 8...
Just size it with your bait, if you are running big bags or skein like Dave mentioned, you need to upsize your hooks....
Also instead of just looping the hook through the top of the bag, I usually pull it through a bit and hook the tip through the side of the bag as well.
Make's it as snagless as possible.