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 cap comprises a cap housing that encases one or more rotating dials. The dials are stacked inside of the cap housing, forming a flat upper surface. 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 identify his or her bottle or contents within the bottle. The present invention fits over standard size valves of various conventional bottles and containers.
