A convertible shopping bag is made of a sheet of material having an outer surface and carries an image with a selected orientation. The sheet is formed into a bag having front and rear walls each with left, right, top and bottom edges. The edges are connected to each other to close a bottom and opposite sides of the bag, and to leave a top opening for receiving and discharging goods. The image has portions which are on at least part of each of the outer surfaces of the sheet at the front and rear walls so that with two of the connected edges disconnected, the bag is unfolded at the remaining connected edges to form a poster with all portions of the image in the correct orientation.