Abstract: An annular series of interconnected rectangular and parallelepiped-shaped folding boxes. The series includes eight interlinked parallelepipeds in two detachable sets of four successive parallelepipeds each. Individual and pairs of successive parallelepipeds are connected one to another by a flexible joint in a hinge-like manner, along mutually adjacent and equal side edges thereof. The flexible joint includes an additional wall strip disposed between mutually adjacent and equal side edges of adjoining successive parallelepipeds for interconnecting therebetween. The wall strip has a width of approximately three to five times the thickness of the cardboard material.