Part 4 2d to 3D josh jakus took on two creative challenges when designing UM bags: to make use of the unique properties of pressed wool felt and to transform a 2D surface into 3D. they lay flat for storage and cleaning, but can be zipped up into bags. UMs are made from two layers of industrial wool felt. the felt comes from factory excess, pieces that would normally go to waste. these bags are made of natural materials. San Francisco 85% wool, 15% mixed fibers.