I'm also a fanny pack hunter. I use the fanny pack as an essentials/possibles bag, and carry the rest of the stuff in one of those camo day packs with the Camelback water system.

In the fanny pack, I'm carrying: three speed loaders, short starter, tin of caps, pre-soaked patches, Surefire flashlight, knife, bone saw, sharpener, orange flagging, parachute cord, license, and a pen - along with a minimal amount of survival stuff and some toilet paper. I don't take this one off while hunting (except to make use of the TP) - as well as the orange vest. I also have a couple of reserve caps taped to the sling swiveljust incase -it's amazing how hard it is to hang onto a cap right after you have put your first shot into a bull elk .