Stopper for a container

A stopper for a container, wherein the stopper has a jacket portion insertable into the container, wherein the jacket portion has a through-opening formed in an axial direction, wherein the stopper has a plurality of segments, wherein each respective segment has a free end, wherein a first portion of the free end of the respective segment forms a subregion of the jacket portion, a second portion of the free end of the respective segment protrudes radially inward in relation to the jacket portion, and a third portion of the free end of the respective segment protrudes radially outward in relation to the jacket portion, wherein the second portions form a cover portion that is configured to be pierced through in the axial direction and that closes the through-opening, and wherein the third portions form a bearing portion of the stopper for bearing against a container edge of the container during insertion of the jacket portion of the stopper into the container.