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Claim 1

A ONE PIECE HEAVY DUTY CONTAINER FORMED FROM A FOLDABLE BLANK AND ADAPTED TO PACKAGE NAILS, OTHER HARDWARE AND GRANULAR MATERIALS REQUIRING POSITIVE SIFT-PROOF PROTECTION, SAID CONTAINER HAVING VERTICAL SIDE WALLS IN TUBULAR FORM AND PAIRS OF OPPOSED BOTTOM CLOSURE FLAPS HINGEDLY CONNECTED TO SAID SIDE WALLS AND HAVING FREE INNER END EDGES OPPOSITE SAID SIDE WALL CONNECTIONS, THE CLOSURE FLAPS COMPRISED OF AN INNER PLY AND AN OUTER PLY IN FLATWISE RELATION TO EACH OTHER AND INTEGRALLY FOLDABLY CONNECTED AT THEIR INNER END EDGES, MEANS FOR PROVIDING A SIFT PROOF SEAL OF SAID BOTTOM CLOSURE WITH SMOOTH UNOBSTRUCTED SURFACES, SAID MEANS COMPRISING SEALING TABS EACH INTEGRAL WITH ONE OF SAID PLIES AT THE END EDGES OF AT LEAST ONE PAIR OF OPPOSED DOUBLE PLY BOTTOM FLAPS AND IN ALIGNED RELATION TO EACH OTHER, SAID SEALING TABS IN OVERLAPPING RELATION TO THE OPPOSED BOTTOM CLOSURE FLAP, SAID AT LEAST ONE PAIR OF OPPOSED FLAPS INFOLDED WITH THEIR INNER EDGE END EDGES IN ABUTTING RELATION AND THE OTHER PAIR OF OPPOSED BOTTOM FLAPS BEING INFOLDED IN FLATWISE RELATION THERETO, SAID PAIRS OF BOTTOM FLAPS SECURED TOGETHER IN SIFT PROOF RELATION.