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A paperboard container folded from a single unitary blank of paperboard has a bottom wall, opposite side walls, and opposite end walls. Stacking tabs project from an upper edge of the end walls for receipt in corresponding slots in end edges of the bottom wall of an adjacent stacked container, and

A paperboard container folded from a single unitary blank of paperboard has a bottom wall, opposite side walls, and opposite end walls. Stacking tabs project from an upper edge of the end walls for receipt in corresponding slots in end edges of the bottom wall of an adjacent stacked container, and ventilation openings are formed in the side and end walls for circulation of air. The end walls are formed by inner and outer roll-over panels, and are slightly inwardly inclined to provide space for circulation of air between the containers when two of them are abutted together in end-to-end relationship. First extension flaps on the ends of the inner roll-over panels lie against and are secured to the inner surface of adjacent side walls, and second extension flaps on the ends of the side walls extend between and are captured by the inner and outer roll-over panels. In a preferred embodiment, the first extension flaps and the roll-over panels are held in place by interengaged detent tabs and slots.

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What is claimed is: 1. A stackable container folded from a single unitary blank of paperboard, comprising: a bottom wall, opposite end walls, and opposite side walls; said side walls foldably joined to opposite sides of said bottom wall; said end walls each comprising an outer roll-over panel and a

What is claimed is: 1. A stackable container folded from a single unitary blank of paperboard, comprising: a bottom wall, opposite end walls, and opposite side walls; said side walls foldably joined to opposite sides of said bottom wall; said end walls each comprising an outer roll-over panel and an inner roll-over panel, said outer roll-over panels foldably joined along a first edge to a respective adjacent edge of the bottom wall, and said inner roll-over panels foldably joined along a first edge to a second edge of a respective outer roll-over panel, said inner and outer roll-over panels, in their operative positions, being folded into closely adjacent, parallel, overlying relationship to one another so that the outer roll-over panels form outer end wall panels and the inner roll-over panels form inner end wall panels; first securing means securing the inner and outer roll-over panels in their operative positions; first extension flaps foldably joined to opposite ends of the inner roll-over panels, said first extension flaps lying alongside an inner surface of respective adjacent side walls; second securing means securing the first extension flaps in position alongside the inner surfaces of the respective side walls; and second extension flaps foldably joined to opposite ends of the side walls, said second extension flaps being captured between the inner and outer roll-over panels. 2. A container as claimed in claim 1, wherein: spaced stacking tabs are on an upper edge of the end walls, and openings are in an end edge of the bottom wall and a lower edge of the end walls in positions to register with the stacking tabs when the container is stacked on top of another container, whereby the stacking tabs extend into the openings to index the respective slacked containers into properly aligned relationship and to positively retain them in stable stacked relationship. 3. A container as claimed in claim 2, wherein: the stacking tabs are of two ply construction, comprising a first tab projecting upwardly from an upper edge of the respective outer roll-over panel, and a reinforcing second tab projecting upwardly from an upper edge of the captured second extension flaps and lying against said first tab. 4. A container as claimed in claim 1, wherein: said first extension flaps are joined to the inner roll-over panels by closely spaced parallel fold lines positioned so that when said first extension flaps are folded to lie against said inner surface of the respective side wall, the fold lines define diagonal corner panels that lends stacking strength to the container. 5. A container as claimed in claim 1, wherein: the end walls are inwardly inclined by about 2° to about 4° relative to the vertical to provide space for circulation of air when two containers are arranged in end-to-end abutting relationship with one another. 6. A container as claimed in claim 1, wherein: ventilation openings are formed through at least some of said side and end walls to provide for circulation of air through the container. 7. A container as claimed in claim 6, wherein: the ventilation openings include recessed areas in an upper edge of the side walls. 8. A container as claimed in claim 1, wherein: a lid panel is foldably joined to an upper edge of each side wall, and said lid panels are folded inwardly over the container to form at least a partial lid. 9. A container as claimed in claim 2, wherein: a lid panel is foldably joined to an upper edge of each side wall, said lid panels being folded inwardly over the container to form at least a partial lid; and side edges of each lid panel are adapted to frictionally engage an adjacent edge of the stacking tab to hold the partial lid panels in closed position. 10. A container as claimed in claim 9, wherein: the stacking tabs are of two ply construction, comprising a first tab projecting upwardly from an upper edge of the respective outer roll-over panel, and a reinforcing second tab projecting upwardly from an upper edge of the second extension flap and lying against said first tab, said first tab having a greater width than said second tab; and an undercut notch is formed in said adjacent edge of said first stacking tab immediately adjacent an upper edge of the associated end wall to provide a positive detent holding said partial lid in closed position. 11. A container as claimed in claim 1, wherein: said first and second securing means comprise interengaged detent tabs and slots to latch the inner roll-over panels and the first extension flaps in operative position, said interengaged detent tabs and slots enabling said container to be set-up by hand without requiring the use of adhesives. 12. A container as claimed in claim 11, wherein: said detent tabs include a plurality of spaced apart first detent tabs projecting from a lower edge of the inner roll-over panels for cooperation with aligned slots formed in an edge portion of the bottom wall, and a second detent tab projecting from each said first extension flap toward the adjacent side wall for cooperation with a slot formed in said adjacent side wall. 13. A container as claimed in claim 12, wherein: said first extension flaps are joined to the inner roll-over panels by closely spaced parallel fold lines positioned so that when the first extension flap is folded to lie against the inner surface of the end wall, the closely spaced parallel fold lines define a diagonal corner panel that lends stacking strength to the container; and said second detent tabs are formed by cuts made in said first extension flaps so that said second detent tabs extend parallel to the plane of a respective diagonal corner panel and toward said adjacent side wall, and project beyond said first extension flaps and into an associated said slot in said adjacent side wall. 14. A container as claimed in claim 1, wherein: spaced stacking tabs are on an upper edge of the end walls, and openings are in an end edge of the bottom wall in positions to register with the stacking tabs when the containers are stacked on top of one another, whereby the stacking tabs extend into the openings to positively retain the stacked containers in stable stacked relationship, said stacking tabs being of two ply construction, comprising a first tab projecting upwardly from an upper edge of the associated outer roll-over panel, and a reinforcing second tab projecting upwardly from an upper edge of the associated second extension flap and lying against said first tab; said first extension flaps are joined to the inner roll-over panels by closely spaced parallel fold lines positioned so that when the first extension flaps are folded to lie against said inner surface of said side walls the fold lines define diagonal corner panels that lend stacking strength to the container; said end walls are inwardly inclined by about 2° to about 4° relative to vertical to provide space for circulation of air when two containers are arranged in end-to-end abutting relationship with one another; and ventilation openings are formed through at least some of said side and end walls to provide for circulation of air through the container. 15. A container as claimed in claim 14, wherein: a lid panel is foldably joined to an upper edge of each side wall, said lid panels being folded inwardly over the container to form at least a partial lid; and a side edge of each lid panel is adapted to frictionally engage an adjacent edge of the stacking tab to hold the lid panels in closed position. 16. A container as claimed in claim 15, wherein: said first tabs have a greater width than said second tabs; and an undercut notch is formed in an edge of each said stacking tab immediately adjacent an upper edge of the associated end wall to provide a positive detent for engaging and holding an edge of said lid panels. 17. A container as claimed in claim 16, wherein: said first and second securing means comprise interengaged detent tabs and slots to latch said inner roll-over panels and said first extension flaps in operative position, said interengaged detent tabs and slots enabling said container to be set-up by band without requiring the use of adhesives. 18. A container as claimed in claim 17, wherein: said detent tabs include a plurality of spaced apart first detent tabs projecting from a lower edge of said inner roll-over panels for cooperation with aligned slots formed in an edge portion of the bottom wall, and a second detent tab projecting from each said first extension flap toward the adjacent side wall for cooperation with a slot formed in said adjacent side wall, said second detent tab being formed by cuts made in the first extension flaps so that said second detent tabs extend parallel to the plane of an associated diagonal corner panel and toward an adjacent said side wall, and project beyond an associated first extension flap and into the slot in said adjacent side wall. 19. The container as claimed in claim 1, wherein said side walls have a length that is greater than said end walls.