Thai research rarely mentions product design and development from waste, such as transforming sedge plant fiber wastes into new, market-oriented items. This study aims to reinvent product design from residues. This mixed-method study focused on communitybased participatory research (CBPR) in a Thai village. This study provides an effective, simple, technological, and strategic approach to adding value to sedge plant fiber waste from reed mat production in simple steps (manufacturing raw materials, pulping method, sheetforming process, experimenting with materials, investigating community reactions to manufacturing process, and product design).