Provided is a reusable container cap adapted to help identify a container belonging to a particular user or to help identify contents of a container when there are several containers similar in appearance. The reusable bottle cap includes a cap housing that encases one or more rotating dials. The dials are stacked inside of the cap housing. A visible surface of each of the dials features letters, numbers, or symbols near its outer edge. The cap housing has a cutout that allows the user to rotate the dials using his or her fingers. When the dials are rotated, a combination of letters, numbers, or symbols are displayed, enabling the user to identify his or her bottle or contents within the bottle. The present invention fits over openings and bottle caps of various sized bottles and containers.