Flexible fastener with unidirectional opening

Claim 1

A RECLOSABLE FLEXIBLE CONTAINER COMPRISING: A PLASTIC FILM BAG HAVING FIRST AND SECOND OPPOSING WALL PORTIONS, INTERLOCKING RIB AND GROOVE ELEMENTS FORMED INTEGRALLY AT THE INNER SURFACE OF SAID BAG ABOUT THE OPENING THEREOF, SAID BAG HAVING EXTERNAL FLANGES EXTENDING OUTWARDLY OF SAID ELEMENTS WHICH MAY BE GRIPPED AND DRAWN APART TO SEPARATE SAID ELEMENTS, SAID BAG BEING RECLOSABLE BY PRESSING SAID ELEMENTS TOGETHERE, A RIB ELEMENT FORMED AT SAID FIRST WALL PORTION AND A GROOVE ELEMENT FORMED AT SAID SECOND WALL PORTION, A FIRST OF SAID ELEMENTS DEFINING A CROSS-SECTIONAL CENTERLINE EXTENDING THERETHROUGH FROM SAID FIRST WALL PORTION TO SAID SECOND WALL PORTION, A SECOND OF SAID ELEMENTS INTERLOCKABALE WITH SAID FIRST ELEMENT AND ATTACHED TO SAID SECOND WALL PORTION AT A BASE, SAID BASE HAVING A POINT OF ATTACHEMENT TO SAID SECOND WALL WHICH IS INWARDLY OF THE OUTERMOST POINT OF ENGAGEMENT BETWEEN SAID RIB ELEMENTS AND HAVING A CENTER DISPLACED OUTWARDLY OF SAID CENTERLINE OF SAID FIRST ELEMENT WHEREBY SAID BAG OPENS RELATIVELY EASILY FROM THE OUTSIDE AND RESISTS OPENING FROM THE INSIDE.