The title compound, [CuI(C(11)H(10)N(2)S(2))](n), is built around centrosymmetric dinuclear Cu(2)I(2) cores, each of which is linked to four neighboring Cu(2)I(2) units via flexible dithioether ligands, viz. 4,4'-(methylenedithio)dipyridine, to form a two-dimensional grid containing rhombus-shaped cavities with diagonal distances of ca 15 and 22 A. Two of these networks interpenetrate in a woven fashion, and the resulting structure does not possess any open channels or cavities. Each Cu atom is in a distorted tetrahedral coordination environment.