I have an over the shoulder bag that I never use for hunting. Most of my small upland game hunting is doves and quail. Vests are okay, but restrictive at times.
I like this type bag, and have used them for most of my life. It is just hard to improve on this design. Just make sure it does not have the bags that slide around on the belt, but are secured in place like these. I don't really care for the snap pocket closures, but you can usually fold the top back for easy shell access. Dove shooting, when I walk out to pick up a dove, I can drop it in my rear game pocket and have both hands free for my gun, often allowing me another good shot or two before I get back to my stool. Once there the bird can be put in a cooler, etc.
http://www.filson.com/products/tin-cloth...aProduct=cc1513 Other companies, like Cabela's, have them at lesser prices.
SRH