To provide a method to utilize a bag with useful information printed thereon to encourage resource saving and environmental conservation by printing useful information on the back surface of a bag for enclosing goods at the request of a person wanting the printing and by passing the bag to a user of the bag and by utilizing the bag usefully.

A person distributing the bag prints useful information on the back surface of the bag used by the person distributing the bag at the request of the person wanting the printing. The person distributing the bag passes the bag containing goods to the user at selling the good and the user receives a service of the useful information on the bag.