B65D 5/3678

Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper specially constructed to allow collapsing and re-erecting without disengagement of side or bottom connections {formed by folding or erecting a single blank by folding-up portions connected to a central panel from all sides to form a container body collapsed along median lines of two opposite sides and the central panel}