Stackable packaging unit

Stackable packaging unit (1) for the packaging of products (100), the said packaging unit (1) comprising at least one encircling wall (2) provided at least with a corner ridge (3) dividing it into at least two retaining panels (2a) partially folded down towards One another about the said corner ridge (3) so as to hold the said products (100) to be packaged, at least one end of the said corner ridge (3) being connected to the corresponding edges of the said retaining panels (2a) by at least one inclined centring profile chosen from among a centring ridge (7) defining with the said corner ridge (3) a substantially Y shape whose branches are arranged so as to truncate the corner formed by the intersection between the said corner ridge (3) and the corresponding edges of the said retaining panels (2a), and a centring projection (6) extending the said corner ridge (3) and exhibiting a substantially V shape of substantially complementary shape to that of the said centring ridge (7), said packaging unit (1) further comprising at least one intermediate element (8) comprising at least one substantially plane insert wall (8, 80, 81) of polygonal shape, the said insert wall (8, 80, 81) being intended to be disposed so as to bear against at least one of said centring ridge (7) or centring projection (6) of the said packaging unit (1), at least one of the corners (9) of said intermediate element (8) comprising at least two linear or point-like centring wedges (4a, 4b) intended to bear at least in part against at least a part of the said centring ridge (7) or centring projection (6), characterized in that at least one of the said retaining panels (2a) is extended by at least one insert wall (80, 81) defining at least in part the said intermediate element (8), said packaging unit (1) being able to adopt a flattened storage configuration in which at least two of the said retaining panels (2a) that are adjacent are folded back towards one another about the said corner ridge (3) separating them.