Just got me a gray Incase Slim Sleeve for MB 15", and I find it fits the 15" MacBook Pro 2016 well. There is a small gap to the Zipper, but the MacBook is not very loose at all.
It slides slowly inside the sleeve, if you rotate the it head up/down, but not in a negative or unsecure way. Personally I find this gap useful, because it keeps the zipper away from scratching along the MacBook while zipping.
View attachment 682753 (cm)
I've received mine, the same as you, but in different color. I'm disappointed. If the MacBook moves, it can enter in contact with the zipper. The Tucano Second Skin that I still have for my 11 MacBook Air is less premium but finally better : the design of the sleeve don't allow the Mac to touch the zipper at any time.
It's sad because the quality build seems fine, the interior - made with "fake fur" - is very nice and the gap is not that much of a problem (not at all, actually).
I'm gonna get it back to the Apple Store.
Last edited: