B65D 5/0245

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 by folding or erecting a single blank to form a tubular body with or without subsequent folding operations, or the addition of separate elements, to close the ends of the body {with end closures formed by inward folding of flaps, to form a sunken or hollow end wall, e.g. for the packaging of books }