Fashion house Stella McCartney has announced that the Frayme Mylo, said to be the first ever luxury bag made with Mylo mushroom leather, will launch commercially later this year.

The bag was first showcased last October at Paris Fashion Week, and is based on the design of Stella McCartney’s classic Falabella bag. The material used, Mylo, is a leather alternative made by material solutions company Bolt Threads using mycelium (the root structure of mushrooms).