Abstract: This invention relates to a capsule for the top of a bottle which can be opened in a simple movement. The capsule comprises an upper portion connected to a skirt by a frangible connecting means. The capsule fits over the top of the neck of the bottle and once in position is opened by movement of the skirt towards the base of the bottle to break the frangible connecting means. The frangible connecting means may be formed thicker at one point so that the downward opening movement will leave an upper portion and the skirt substantially separated but connected by a thin bridging element.