An intermediate article for assembly to form a container, the intermediate article having a base which is polygonal in plan and having an annular peripheral edge with a plurality of edge portions surrounding a base wall structure, a plurality of wall elements around the base, each wall element being adjacent to a respective edge portion of the polygonal base, wherein each wall element has a pair of opposite outwardly extending edges having a sidewall structure therebetween, each outwardly extending edge comprising at least one member of a respective fixing mechanism for affixing adjacent outwardly extending edges of adjacent wall elements, wherein the sidewall and the base are composed of an injection moulded thermoplastic polymer, and a flexible sheet having a central part which is bonded to the base wall structure and a plurality of extending parts, each extending part being connected to, and extending away from, the central part, each extending part being bonded to the sidewall structure of a respective wall element, wherein each extending part is connected to the central part by a respective hinge part of the flexible sheet, whereby each wall element is hingedly connected to the base by the respective hinge part, wherein the wall elements can be hinged upwardly relative to the base to form a container having a sidewall which is polygonal in plan and defines a central concavity for packaging a product, wherein the sidewall has the plurality of wall elements which are connected in series to form an endless wall member extending upwardly from the base, each outwardly extending edge being affixed to an adjacent outwardly extending edge of an adjacent wall element by a respective fixing mechanism at a respective corner portion of the sidewall.

An injection molded product includes a main body portion having a design surface and an opposite surface; and a projecting portion provided at a peripheral edge portion of the main body portion, and projecting out toward a side opposite from the design surface in a thickness direction of the main body portion, wherein a thickness A of the main body portion and a thickness B of the projecting portion satisfy a relationship of AB.