The present invention relates to a container system having at least two containers, wherein the container system comprises a light or lighted member which is configured to provide information through the emission of light, wherein the container system is configured to provide or trigger the light or lighted member to provide the information through the emission of light when a step which is related to preparing a mixture of contents of the containers is conducted, in particular when the containers are separated from one another and/or when a fiuidic connection is prepared between the containers.
