Get some SnoSeal. I ordered some from Walmart. I use it on all of my leather goods. It conditions the leather as well as protects it. I use it on my boots, belts, holsters, quivers, anything that's leather. It's beeswax based with some solvent to thin it and make it easier to apply. Use a hair dryer to warm the leather, rub it in, heat it to melt and rub it some more. I do this until the leather wont take anymore. Buff off the excess and you'll be golden. I do this on all of the leather products I make. I can't recommend it enough. Make sure to fill any stitching and the ends of the leather as well. It will darken the leather somewhat but the protection it offers is outstanding.
Use SnoSeal. I've never had any trouble with it. Will not rot, Does not stink once finished out.