Need recommendations for an ultra thin or skin like cover for the back of the iPad air that will work with the Apple smart cover. From what I've seen, the really thin skin ones cover the back and wrap around all four sides. I want one that has the cutout to accommodate the magnetic strip of the Smart Cover. I want to keep the iPad as light as possible so I just want something that will prevent scratches when I set it down on a table while being able to accommodate the Smart Cover. Anyone has that kind of set up? Thanks.