Abstract: A container assembly which is especially adaptable to form a final presentation enclosure is constructed from a flat blank of material, optionally having fold lines delineating a bottom, side, and top wall portions which act in conjunction with one another to enclose a space. The side walls may be connectable by joining portions constituting bellows-type folding members. From flat, the container is constructed by folding. Joining members are folded inwardly thereby drawing up respective side walls to which they are attached. The top walls are formed so as to be exposed at the top of the container to allow securing of the top wall portions by any suitable means. There is also provided a variable volume container by means of the joining members which extend into the interior of the container. The joining members act to center and protect a smaller item within the container or can be completely moved to make available the total volume of the container.