A flip-top closure for composite and cardboard packaging, which permits the automatic opening of a package by flipping open the lid of the closure, includes a frame base element, which is designed to be welded by its level underside to composite or card-board packaging, and has a continuous peripheral overhang that protrudes upwards in order to form a pouring neck with an interior opening. A cover that flips open and closes is fixed to the base element. A guide, or tongue, element is pivotally mounted on the base element extends over the interior expanse of the overhang and friction-fit elements act between the tongue, or guide, element and the cover to pivot the tongue downwardly by force when the cover is flipped open for tearing and pivoting away a piece of the packaging lying below the tongue or guide element.