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Claim 1

A FLEXIBLE CLOSURE COMPRISING IN COMBINATION, A PAIR OF FLEXIBLE CLOSURE STRIPS EACH HAVING WEB PORTIONS AND MARGINAL PORTIONS AT THE UPPER EDGE THEREOF, THE MARGINAL PORTION OF ONE STRIP BEING ABOVE ITS WEB PORTION AND SUBSTANTIALLY PARALLEL THERETO BEING OFFSET INWARDLY TO PROVIDE A DOWNWARDLY FACING SHOULDER, THE MARGINAL PORTION OF THE OTHER STRIP BEING ALONGSIDE ITS WEB PORTION AND BEING ATTACHED BY ITS UPPER EDGE TO THE UPPER EDGE OF ITS MARGINAL PORTION BY AN INTEGRAL HINGE PORTION, INTERLOCKING FACING RIB AND GROOVE ELEMENTS EXTENDING ALONG THE INNER SURFACES OF THE MARGINAL PORTIONS, A SLIDER STRADDLING THE UPPER EDGE OF THE STRIPS AND MOVABLE IN ONE DIRECTION FOR JOINING THE STRIPS AND IN THE OTHER DIRECTION FOR SEPARATING THE STRIPS, SAID SLIDER HAVING A BACK ABOVE THE STRIPS AND HAVING SIDE INTEGRAL THEREWITH EXTENDING DOWNWARDLY FROM THE BACK AND TAPERING TOGETHER TOWARD A CLOSING END OF THE SLIDER FOR FORCING THE STRIPS TOGETHER AND DIVERGING TOWARD AN OPENING END OF THE SLIDER, THE LOWER EDGES OF THE SIDES BEING SMOOTH AND STRAIGHT, SAID SLIDER FURTHER HAVING A SUBSTANTIALLY STRAIGHT SEPARATOR FINGER BENT DOWNWARDLY FROM THE BACK AND INTEGRAL THEREWITH BEING INTERMEDIATE THE SIDES AND BEING SUBSTANTIALLY THE LENGTH OF THE SIDES AND PROJECTING BETWEEN THE STRIPS FOR SEPARATING THEM WHEN MOVED IN AN OPENING DIRECTION WITH THE FINGER AT THE OPENING END OF SAID SLIDER, SAID FINGER SHAPED TO HAVE A RIDGE FACING THE CLOSING END OF THE SLIDER AND TO HAVE A V-SHAPED GROOVE FACING THE OPENING END OF THE SLIDER WITH THE FINGER BEING CANTILEVER MOUNTED, A FLAT HOLDING PORTION INTEGRAL WITH THE LOWER END OF THE FINGER AND BENT REARWARDLY TOWARD THE CLOSING END OF THE SLIDER BEING SUBSTANTIALLY AT THE LEVEL OF SAID STRAIGHT EDGES OF THE SIDES OF THE SLIDER AND BEING SUBSTANTIALLY SHORTER THAN THE LENGTH OF THE SLIDER, THE EDGES OF SAID HOLDING PORTION EXTENDING SUBSTANTIALLY PARALLEL TO THE SIDES OF THE SLIDER TO PROVIDE CHANNELS FOR THE STRIPS BETWEEN THE HOLDING PORTION AND EACH OF THE SIDES OF UNIFORM WIDTH ALONG THE LENGTH, AND VERTICAL INDENTATIONS ON EACH OF THE SIDES AT THE CLOSING END THEREOF EXTENDING SUBSTANTIALLY THE FULL LENGTH OF THE SIDES BUT TERMINATING SHORT OF THE LOWER EDGE THEREOF SO THAT THE STRAIGHT SMOOTH EDGE IS NOT INTERRUPTED, THE UPPER SURFACE OF SAID HOLDING PORTION RIDING BENEATH SAID SHOULDER OF THE MARGINAL PORTION RETAINING THE SLIDER ON THE STRIPS AND HOLDING IT PARALLEL TO THE STRIPS.