Tkanki is a Polish brand founded by a young girl Marysia, who sews kidneys and bags from recycled materials, or more precisely from materials found in second-hand stores. The founder cares about making these materials as natural as possible. She uses crap linen, cotton or wool. The brand was founded in 2020. Due to the great interest in kidneys, Marysia is currently working with a seamstress who helps her sew the products. All kidneys and other products are unique and can be created specifically to order. Packages are most often shipped in recycled cardboard boxes.