A blank for making a box around a load

A blank for making a polygonal section box made of sheet material, comprising a sequence of at least four panels connected to one another via fold lines and having lateral flaps connected respectively to said panels via fold lines perpendicular to the fold lines interconnecting said panels, at least two of said panels which constitute a spaced-apart pair have cut-off corners, each of said cut-off corners having at least one edge, and which respectively are the bottom and the top of said box, and intermediate panels are provided between the other at least two panels that constitute a spaced-apart pair and the lateral flaps thereof, which intermediate panels have fold lines with said panels which are parallel to the fold lines of said at least two panels having said flaps, notches being formed in said lateral flaps associated with said intermediate panels, opening out in respective free edges thereof, such that the notches of lateral flaps situated on a side of the blank define an oblong opening after the blank has been folded, and pre-cutout, hinged tongues being formed in the free edges of the lateral flaps of said cover-forming panel having cut-off corners so that after being folded said pre-cutout, hinged tongues engage in said oblong openings, being folded so as to be inserted between the lateral flaps forming a lateral belt for said box.