Zip Handbags Materials: wool felt, nylon zipperDesign process: 2d CAD drafting, iterative paper modelsManufacturer: ActualSF The handbags consist of a flat piece of felt and a single continuous zipper. The shape of the perimeter zipper determines the final 3D zipped shape. The bags all began as 2D flat shapes. The final 3D form was developed experimentally through producing hundreds of paper models.