Fluid containers or cartons

Claim 1

A THIN-WALLED FRACTURABLE CONTAINER ELEMENT CAPABLE OF FRACTURE BY APPLICATION OF FINGER PRESSURE FOR FLOWABLE SUBSTANCES WHEREIN THE WALL OF SAID ELEMENT INCLUDES A PART CONSTITUTING A HOLLOW PROTRUSION, THE BASE PROFILE OF WHICH PROTRUSION INCLUDES AT LEAST ONE CORNER, AND THE WALL OF THE CONTAINER ELEMENT IMMEDIATELY SURROUNDING SAID PROTRUSION LIES WITHIN A RIM WHICH PROJECTS ABOVE THE PLANE OF SAID PART OF THE WALL OF THE CONTAINER ELEMENT TO A GREATER HEIGHT THAN SAID PROTRUSION, SAID PROTRUSION INCLUDING A PAIR OF SIDE WALLS WHICH MEET AT AN EDGE ONE END OF WHICH EDGE LIES AT SAID CORNER WHILE ITS OTHER END IS SUBSTANTIALLY DISPLACED FROM SAID CORNER AND FORMS A PART FROM WHICH PRESSURE CAN BE TRANSMITTED ALONG SAID EDGE TO THE LOCALIZED AREA ADJACENT SAID CORNER TO APPLY A CONCENTRATED LOAD AT SAID LOCALIZED AREA AND CAUSE RUPTURE OF THE WALL OF SAID CONTAINER ELEMENT.