A mushroom bag
Actually not, strictly speaking. The Mylo bag is made from the mycelium of mushrooms, that fibrous underground root structure which sustains the fungi. Although the idea is not new - search "mushroom leather" on Google for many, many leads - it seems that, this year, the technology and process has hit the headlines.
If you fancy helping to support this project, which aims to create sustainable fabrics resembling leather but without harming animals, check out the Kickstarter page.
Picture courtesy of Mylo and Kickstarter.