Flat blank, especially capable of, once assembled and combined and made integral with a cap, forming a package for at least one layer of at least two objects, with the flat blank being of the cardboard type or the like with a number of strong panels, a number of fold lines parallel to a longitudinal direction connecting adjacent panels, a first surface and a second surface, including: - At least one pair of two panels for receiving objects, each delimited transversely by two bottom fold lines, able to be arranged in the assembled blank in an at least essentially coplanar manner and side by side transversely, in such a way that the objects can rest on their first surfaces, - Two similar outside edge panels, arranged laterally, each delimited transversely by a bottom fold line and a top supporting edge, each connected to a receiving panel by a bottom fold line, that can be arranged, in the assembled blank, in an at least essentially parallel manner between them and orthogonal to the receiving panels, - At least one pair of two similar internal spacer panels, arranged in the median, each delimited transversely by a bottom fold line and a top supporting fold line, connected to one another by said top supporting fold line and connected to two receiving panels by two bottom fold lines, that can be arranged, in the assembled blank, against one another by their second surfaces and in a manner that is at least essentially parallel to the edge panels, with the edge panels and the spacer panels having the same orientation relative to the receiving panels and, between their bottom fold line (10b, 10a) and either their top supporting edge or their top supporting fold line, a similar transverse width, characterized by the fact that: - At least one of the edge panels and at least one of the spacer panels comprises, over its top supporting edge, its top supporting fold line, at least one projecting part (16a, 16b) extending essentially in the plane of said edge panel, and of said spacer panel, in the essentially orthogonal direction and in the direction opposite to the bottom fold line (10b, 10a) of said edge panel, and of said spacer panel, - At least one of the receiving panels comprises, adjacent to its bottom fold line (10b, 10a) with an edge panel, and with a spacer panel, at least one through part (17a, 17b) for an insertion essentially into the plane of said edge panel, and of said spacer panel, and in the direction that is essentially orthogonal to said receiving panel, - The projecting part (16a, 16b) and the through part (17a, 17b), respectively, are of sizes and are positioned in a relative manner on the top supporting edge, the top supporting fold line, and the bottom line (10a, 10b), in such a way as to be able, with said blank being assembled, to engage respectively with a through part (17a, 17b) of another similar assembled blank arranged vertically above and with a projecting part (16a, 16b) of another similar assembled blank arranged vertically below. - At least one pair of two panels for receiving objects, each delimited transversely by two bottom fold lines, able to be arranged in the assembled blank in an at least essentially coplanar manner and side by side transversely, in such a way that the objects can rest on their first surfaces, - Two similar outside edge panels, arranged laterally, each delimited transversely by a bottom fold line and a top supporting edge, each connected to a receiving panel by a bottom fold line, that can be arranged, in the assembled blank, in an at least essentially parallel manner between them and orthogonal to the receiving panels, - At least one pair of two similar internal spacer panels, arranged in the median, each delimited transversely by a bottom fold line and a top supporting fold line, connected to one another by said top supporting fold line and connected to two receiving panels by two bottom fold lines, that can be arranged, in the assembled blank, against one another by their second surfaces and in a manner that is at least essentially parallel to the edge panels, with the edge panels and the spacer panels having the same orientation relative to the receiving panels and, between their bottom fold line (10b, 10a) and either their top supporting edge or their top supporting fold line, a similar transverse width, - At least one of the edge panels and at least one of the spacer panels comprises, over its top supporting edge, its top supporting fold line, at least one projecting part (16a, 16b) extending essentially in the plane of said edge panel, and of said spacer panel, in the essentially orthogonal direction and in the direction opposite to the bottom fold line (10b, 10a) of said edge panel, and of said spacer panel, - At least one of the receiving panels comprises, adjacent to its bottom fold line (10b, 10a) with an edge panel, and with a spacer panel, at least one through part (17a, 17b) for an insertion essentially into the plane of said edge panel, and of said spacer panel, and in the direction that is essentially orthogonal to said receiving panel, - The projecting part (16a, 16b) and the through part (17a, 17b), respectively, are of sizes and are positioned in a relative manner on the top supporting edge, the top supporting fold line, and the bottom line (10a, 10b), in such a way as to be able, with said blank being assembled, to engage respectively with a through part (17a, 17b) of another similar assembled blank arranged vertically above and with a projecting part (16a, 16b) of another similar assembled blank arranged vertically below.