Abstract: A cap for substantially gas-tight sealing engagement with a container wall having an opening therein circumscribed by a sealing surface has an end wall and a depending skirt with a portion for securing the cap to a container wall, and a tab for manual engagement to rotate the cap between a container wall sealing surface engaging position and a storage position. The cap has a vent region provided by a weakened zone that is preferably located on or near the tab. The weakened area may include removal of a portion of the cap skirt, thinning a portion of the cap skirt, variations in wall thickness of portions of the cap skirt or top wall in a predetermined manner, configurating the portion of the tab which connects with the cap in such a manner as to facilitate ready circumferential expansion of the cap. Combinations of these weakening features may be employed.

Abstract: An improved easy open can end construction for resealable easy open beverage cans having a hinged and inwardly depressible opening panel defined by an involuted spiro-circular score line having an initial portion that at least partially encircles a pressure application zone, an intermediate portion that continually recedes therefrom and an end portion of circular configuration.