For feeding needs inside the coop I purchased from Amazon the Harris Farms 7lb Hanging Feeder. The 7lb Feeder is to be good for up to 15 chickens. Harris Farms also make 10lb and 25lb feeders.
The Feeder arrived the other day and from the eyes of an inexperienced poultry farmer it looks sturdy and built solid. I have read that the height of the feeder should be equal to the back of the birds. In fact, some people hang the feeder just so the chicken has to stretch a bit to get to the food. This is suppose to keep the mess to a minimum. I am going to use a chain so that the height is easily adjustable as the chickens grow.