A mask is assembled from a single blank. The blank is creased and folded to make a front, top and a back panel, with the top panel folding down to make two side panels. The side panels cooperate with the front and back panels by connections protruding from the panels. The mask can be stored or shipped in a flat two-dimensional, unassembled mode and can be opened or assembled to a three-dimensional form, which may be worn on the head of a user.