a container set comprises a first container adapted to be reused by being refilled with the contents of a second container containing a product of a volume not exceeding the volume of the first container . the two containers comprise mouth parts with guide faces allowing a coupling together of the containers in a position in which said containers are mutually immovable in radial direction . furthermore , the mouth parts of the containers comprise co - operating sealing faces preventing the contents from leaking into the surroundings when the coupled containers are manipulated in order to transfer the contents from the second container to the first container .