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Claim 1

A SIFT PROOF CONTAINER FORMED FROM A FOLDABLE FIBREBOARD BLANK AND HAVING TUBULARLY ARRANGED WALL PANELS AND CLOSURE FLAPS ON AT LEAST ONE END OF THE CONTAINER, THE FLAPS INCLUDING AN INNERMOST PAIR IN OPPOSED RELATION AND AN OUTERMOST PAIR IN OPPOSED RELATION WITH EACH SUCH FLAP CONNECTED BY A FLAP FOLD TO ONE END OF A RESPECTIVE WALL PANEL, SAID FLAPS HAVING SIDE EDGES DEFINED BY LINES OF SEVERANCE IN THE OUTER SURFACE AND IN FOLDABLY CONNECTED RELATION ON THE INTERIOR SURFACE THEREOF THROUGHOUT THEIR ADJACENT EXTENT PRIOR TO INFOLDING TO CLOSING RELATION, THE FLAPS COMPRISING THE INNERMOST PAIR HAVING FREE END EDGES IN ABUTTING RELATION AT THE CONTAINER MIDWITH, SEALING WEBS SEPARATED FROM THE INTERIOR SURFACE OF THE OUTERMOST FLAPS BY TEARING OF THE FIREBOARD AND HAVING A FREE EDGE INITIATED AT THE FREE END EDGE OF THE ADJACENT INNERMOST FLAP, SAID SEALING WEBS CONNECTING THE SIDE EDGES OF THE INNERMOST FLAPS THROUGHOUT THEIR EXTENT TO ADJACENT PORTIONS OF A RESPECTIVE ONE OF THE OUTERMOST FLAPS TO PROVIDE A SEAL EXTENDING ENTIRELY ACROSS THE CONTAINER AT THE INNERMOST FLAP SIDE EDGES, THE SEALING WEBS EACH BEING FOLDED ON ITSELF WITH END PORTION FREE EDGE AT LEAST INTERSECTING AT THE CONTAINER MIDWITH TO COMPLETELY CLOSE THE END OF THE CONTAINER AND PREVENT SHIFTING OF THE CONTENTS THROUGH SAID CLOSURE.