After reading the negative reviews on here, I was concerned the sleeve would be too tight for the MacBook Air 11". I went down to the Apple store to test it with their computers. It fits perfectly! The computer will not slide around but it is also not at all difficult to zip; it fits exactly as it should with a little bit of room on each side. Perhaps the other people were trying to fit a MacBook Pro in the case (which is thicker and would not be compatible) or the 13" Air. Also love the fuzzy inside lining Incase does on all their sleeves.