Pressure closable fastener

Claim 1

THE COMBINATION OF A CONTAINER POUCH HAVING FIRST AND SECOND WALL PORTIONS, A POUCH OPENING, AND A CLOSURE FLAP PIVOTALLY SUPPORTED AT SAID FIRST WALL PORTION AND EXTENDING THEREFROM OVER SAID POUCH OPENING FOR HAVING THE INNER SURFACE THEREOF OVERLYING SAID SECOND WALL PORTION, A FLEXIBLE CLOSURE BUTTON DISPOSED FOR MAINTAINING SAID CLOSURE FLAP IN OVERLYING RELATION WITH SAID SECOND WALL PORTION, SAID FLEXIBLE CLOSURE BUTTON HAVING A FIRST BUTTON MEMBER SECURED TO THE INNER FACE OF SAID CLOSURE FLAP AND HAVING A SECOND BUTTON MEMBER FIXEDLY SECURED AT THE OUTER SURFACE OF SAID SECOND WALL PORTION, SAID FIRST AND SECOND BUTTON MEMBERS BEING CONSTRUCTED OF A RESILIENT THERMOPLASTIC SUBSTANCE AND HAVING A PLURALITY OF INTERLOCKING RIB AND GROOVE ELEMENTS FORMED THEREON FOR ALLOWING ADJUSTABLE ALIGNMENT OF SAID CLOSURE FLAP WITH SAID SECOND WALL PORTION, EACH OF SAID INTERLOCKING RIB AND GROOVE ELEMENTS HAVING A LOCKING STRENGTH FOR HOLDING SAID CLOSURE FLAP IN AN OVERLYING RELATION WITH SAID SECOND WALL PORTION, SAID RIB AND GROOVE ELEMENTS OF SAID FIRST BUTTON MEMBER BEING COMPLEMENTARILY AND RELEASABLY RECEIVED BY SAID RIB AND GROOVE ELEMENTS OF SAID SECOND BUTTON MEMBER, WHEREBY INCREASED CONTENTS OF SAID CONTAINER PUNCH MAY BE ACCOMMODATED BY SAID ADJUSTABLY ALIGNED FLEXIBLE CLOSURE BUTTON AND WHEREBY SAID RIB AND GROOVE ELEMENTS DO NOT HAVE TO BE EXACTLY ALIGNED AND THE INTERLOCKING OF ONE OR MORE, BUT NOT NECESSARILY ALL, RIB AND GROOVE ELEMENTS IS SUFFICIENT FOR KEEPING THE ENVELOPE CLOSED.