Envelope or bag with self-contained opener

Claim 1

A PLASTIC BAG FOR PACKAGING AND RETAILING COMMODITIES COMPRISING OPPOSED FRONT AND BACK WALLS HAVING THEIR COOPERATING MARGINAL EDGES JOINED AND DEFINING FLUID-TIGHT, AIR-TIGHT BAG, SAID BAG BEING OPENABLE AT ONE END AND HAVING TERMINAL LIP PORTIONS OF THE OPENABLE END SUPERIMPOSED UPON EACH OTHER AND HEAT-SEALED, SAID HEAT SEALED LIP PORTIONS COMBINING WITH EACH OTHER IN PROVIDING A NORMALLY SEALED BAG CLOSURE, SAID CLOSURE HAVING A ROW OF PERFORATIONS EXTENDING FROM ONE TRANSVERSE END TO THE OTHER TRANSVERSE END, SAID ROW OF PERFORATIONS BEING SPACED INWARDLY FROM AND BEING PARALLEL WITH THE FREE OUTER LENGTHWISE EDGES OF THE HEAT-DEALED LIPS, AND BEING PARALLEL WITH, PROXIMAL TO BUT SPACED SLIGHTLY FROM THE INNERMOST SEALED PORTIONS OF THE LIPS, WHEREBY TO PROVIDE A TWO-PLY TEAR STRIP CAPABLE OF BEING DETACHED AND BODILY REMOVED WHILE PERMITTING MINIMAL BUT STILL INTACT PORTIONS OF THE SEAL TO REMAIN TEMPORARILY CLOSED.