Abstract: A container of a plastic material has a container body (1) for receiving a fluid and a neck part (7) adjoining the container body (1). The neck part (7) has at its free end a discharge opening for the fluid closed by a head part (11) and covered by a cap (19). The cap (19) interacts with individual blocking elements via a retaining ring (21), starting from an attachment position of the cap (19). Rotary motions in both directions of rotation are permitted along a predetermined path of travel. During a further screw-on motion beyond the predetermined path of travel, a part of second blocking elements completely passes over assigned first blocking elements, and in so doing the head part (11) is penetrated by the opening part of the cap (19).