Abstract: It consists of a laminar portion (10) with a harmless adhesive coating on at least part of one of its faces, which is applied over the upper end (12) of the can (11), fitted with a ring-pull opener (13) that breaks a fin that is bent inside the can (11) and remains joined to the said ring-pull (13). The laminar portion (10) includes a pull appendage (17) together with a strip (15) that is connected to a band (16) having an adhesive coating, prepared for being joined around a portion of the body of the can (11). By pulling on the said appendage (17) the said laminar portion (10) can be removed, the strip (15) can rotate about its own plane and the laminar portion (10) is able to be stuck by its adhesive face to the side wall of the can (11).