This man is bringing milk directly from his small cow farm into a house that sells it to the people in the neighborhood in town.
People will bring their own containers to buy milk at that house. They will bring bottles, open pails, cooking pans, old plastic milk bottles, water pitchers, and even cereal bowls to save money.
He has two 5 or 6 gallon containers on his pack mule. It is not refrigerated but do so I hope the milk is pasteurized and is safe to drink. It is fresh each morning - it might be still warm from the cow to you.