The invention provides a foamed-elastomer collapsible box divider for dividing a box into at least six cushioned compartments when extended, and when collapsed having the form of an elongated component stepped on four edges as viewed from a side. The steps being formed by two face-to-face central elongated leaves, in combination with a short top and a short bottom leaf, and at least a first and a second leaf of intermediate length. The first intermediate leaf being disposed between the short top leaf and the central elongated leaves, and the second intermediate leaf being disposed between the short bottom leaf and the central elongated leaves, each leaf being separate along a major portion of its length from adjacent leaves and being transversely cut through part of its thickness at a pitch corresponding to the width of one of the compartments, each elongated and intermediate leaf being joined to adjacent leaves by at least one narrow connecting line adjacent to the transverse cut, the connecting line being formed by the remaining uncut material adjacent to the transverse cut.