A one-piece container formed from a single unitary blank of corrugated paperboard wherein the container comprises: a bottom wall, opposed side walls (12, 13) and opposed end walls (14, 15), one of either the side walls or the end walls being inwardly inclined; stacking tabs on a top edge of the inwardly inclined walls, said stacking tabs extending coplanar with the associated inclined wall; tab locks in the bottom wall in positions to receive the stacking tabs of a subjacent container when said containers are stacked on top of one another; a reinforcing corner post extending the full height of the container in each corner, said corner posts each being formed by panels extending from opposite ends of a said inwardly inclined wall, said panels including a first panel foldably joined to an end of a said inwardly inclined wall and extending perpendicular to said inclined wall, a second panel foldably joined to said first panel and extending diagonally from said first panel toward said inclined wall, and a third panel foldably joined to said second panel and extending parallel to and adhered to an adjacent one of said walls that is inwardly inclined; characterised in that said third panels each have a stacking tab on an upper edge thereof in alignment with and lying against the stacking tab on an adjacent said inwardly inclined end wall, whereby said stacking tabs have a double thickness; a lid panel (16, 17) is foldably joined to an upper edge of each said side wall; each said lid panel (16, 17) has a slot in each opposite end thereof in position to receive a stacking tab on a respective said inclined end wall when the lid panel (16, 17) is folded into horizontal closed position over said container; a locking tab is foldablyjoined to an end of each said lid panel (16, 17) adjacent each said slot, said locking tabs adapted to fold downwardly over an upper edge of a respective said end wall, and a heel on each said locking tab adapted to extend upwardly and lie against an outer surface of an adjacent stacking tab when said locking tab is folded downwardly over a said end wall whereby a slot results when the locking tabs and associated heels are folded out of the plane of the respective lid panel adapted to receive the stacking tab; pads being folded down to lie over top of an upper end of said corner post, and in that the tab locks comprise a slot coupled with a bendable flap designed to engage the stacking tab of the subjacent container to frictionally hold it in the slot. a bottom wall, opposed side walls (12, 13) and opposed end walls (14, 15), one of either the side walls or the end walls being inwardly inclined; stacking tabs on a top edge of the inwardly inclined walls, said stacking tabs extending coplanar with the associated inclined wall; tab locks in the bottom wall in positions to receive the stacking tabs of a subjacent container when said containers are stacked on top of one another; a reinforcing corner post extending the full height of the container in each corner, said corner posts each being formed by panels extending from opposite ends of a said inwardly inclined wall, said panels including a first panel foldably joined to an end of a said inwardly inclined wall and extending perpendicular to said inclined wall, a second panel foldably joined to said first panel and extending diagonally from said first panel toward said inclined wall, and a third panel foldably joined to said second panel and extending parallel to and adhered to an adjacent one of said walls that is inwardly inclined; characterised in that said third panels each have a stacking tab on an upper edge thereof in alignment with and lying against the stacking tab on an adjacent said inwardly inclined end wall, whereby said stacking tabs have a double thickness; a lid panel (16, 17) is foldably joined to an upper edge of each said side wall; each said lid panel (16, 17) has a slot in each opposite end thereof in position to receive a stacking tab on a respective said inclined end wall when the lid panel (16, 17) is folded into horizontal closed position over said container; a locking tab is foldablyjoined to an end of each said lid panel (16, 17) adjacent each said slot, said locking tabs adapted to fold downwardly over an upper edge of a respective said end wall, and a heel on each said locking tab adapted to extend upwardly and lie against an outer surface of an adjacent stacking tab when said locking tab is folded downwardly over a said end wall whereby a slot results when the locking tabs and associated heels are folded out of the plane of the respective lid panel adapted to receive the stacking tab; pads being folded down to lie over top of an upper end of said corner post, and in that the tab locks comprise a slot coupled with a bendable flap designed to engage the stacking tab of the subjacent container to frictionally hold it in the slot.