Abstract: A closure 1 for closing a container comprises a closure body, which has a front wall 3, a side wall 2 and a transition portion 4 between the front wall 3 and the side wall 2. An annular projection 8, extending from the front wall 3, is provided for contact on the top side 10a of the mouth piece 10 of the container. An outer seal 9 is formed as a tongue 9 which extends from the side wall 2 and/or from the transition portion 4 towards a central axis A of the closure 1. The tongue 9 rests flexibly against the contour of the outer edge 10b and/or outside 10c of the mouth piece 10 when the closure 1 is attached to the mouth piece 10 of the container.

Abstract: A closure 1 for closing a container, especially for closing the mouth piece 10 of a bottle, comprises a closure body, which has a front wall 3, a side wall 2 and a transition portion 4 between the front wall 3 and the side wall 2. An annular projection 8, extending from the front wall 3, is provided for contact by the projection 8 on the top side 10a of the mouth piece 10. An outer seal 9 is formed as a tongue 9 which extends from the side wall 2 and/or from the transition portion (4) in the direction of a central axis A of the closure 1. The tongue 9 is formed so as to be thin, such that it rests flexibly against the contour of the outer edge 10b and/or outside 10c of the mouth piece 10 when the closure 1 is attached to the mouth piece 10 of the container.