I have been using a 3-4 mm veg tanned leather, I wrap it around a mold then a few minutes after dipping in boiling in water I remove them (otherwise they get a little hard to take off) then I treat in a variety of different ways, for me it is all experimental, of the vases I show here the darker one is dyed using a water based leather dye, they are both finished with leathe balm with atom wax. the basket is finished on the inside with a leather edge paint because I did not like the look of dye on the back of the leather and it is what I had on hand, not sure it is the right thing to be using if some one has a suggestion on a better finish I would love to know. the other vase is not water proof,