In this age of countless plastic bags, hard cases, silicone overcoat and keyboard covers me the envelope appeared as pleasant change - and I was not disappointed. Meticulously crafted to serve as "second case" my Tab S 8.4 if it is not exactly on the road in the original book cover. The substance is discreet but not boring, the lining cleans a bit the screen when removing and overall takes the bag the Tab its "thinness" not too much. While it offers little protection when dropped, but as a fancier scratch protection, it is recommended.
(Did get the cover for the OnePlus One fetched from the same manufacturer - with similarly positive overall impression)