There were also free plastic pitchers available. To use the milk, you put the bag in the pitcher and cut off a corner. It pours really easily. You then twist the corner down and put it in the fridge. It fits perfectly in the door.
So, if you have Kwik Trip in your area, give their milk in a bag a try. You'll save about 50 cents per gallon and have the novelty of pouring milk on your cereal from a pitcher. While you're at Kwik Trip, you might find some good deals on things like bananas and bread as well.