Everyday, the raw milk is collected from the storage tank into a large, refrigerated tanker and is taken to a dairy processing plant where it will be made and packaged into the dairy products that you buy at the grocery stores. Depending on how much is being sold at the stores, the people at the dairy plants tell the milk collectors how much milk they will need. The milk collectors then go out and get the amount of milk they need from the dairy farms. Sometimes, dairy farmers in an area belong to a local organization called a co-op. Co-ops act as managers for the dairy farmers. They make decisions about collecting and selling the farmers' milk to the dairy plants.