How can we use more of the materials and products that have already been produced? At the second hand shopping mall ReTuna in Eskilstuna, where circular flows are a reality, there are still many products going to waste. This master thesis project explores the possibilities of upcycle and repurpose driven design, and by that adding new value to existing products. The process of doing that is the basis of this report.  ReTuna Återbruksgalleria is a place where people can leave products they do not want or need anymore.Everyday hundreds of products are left for reuse at ReTuna, which is connected to the overconsumptionthat results in copious amounts of second hand products. Much more than can be taken care of in today’s system. The resources put into every product needs to be valued accordingly to what they truly cost and emit.  This master’s thesis project explores how to design within the planetary boundaries by taking care and responsibility for what already is produced. The first phase of the project consists of observations and interviews to get an understanding of how ReTuna works. The framing of the project was decided after the research phase, which resulted in focus on one specific product, dining chairs. The next part of the project involves upcycling workshops, building of prototypes and an exhibition, all with a focus on increasing the value for second hand chairsand giving the material new areas of use. The last part of the project presents a design result, with an approach for involving more repurpose driven design and upcycling within design and product development.