Last time I had chickens I lived in the suburbs and kept feed inside the house. I stored it in a gamma vault container. We had no mice or other pests to worry about. Now we are out in the country and need to figure out what to store our feed in. It will be out in a shed near the chickens. I'm sure mice and such could figure out it's there and chew through a plastic container. What are your favorite pest proof containers to store 50+lbs of feed, scratch, DE...?