pittsburgpam the way I am making mine is with the thick 1" foam insulation board you get from the home store. They are four feet by 8 feet and weigh nothing at all. I will cut mine so that it is four feet by four feet and cover each peice with flannel then "hinge" them together so they stand like a book on end. I am thinking I will use elastic to hinge them. That part is still fuzzy in my mind at this point. But they are easy to put something into if need be.