The present invention pertains to a 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. The stackable packaging unit (1) also comprises an intermediate element. The invention also pertains to a packaging comprising at least one such packaging unit (1).