Very tight, here are the exact internal dimensions: Tech-Protec Neop: 33.5 x 22.5 x 3 cm MacBook Air 15": 34.04 x 23.76 Personally, I don't think the case is really good, there are alternatives. I myself bought something from TomToc on Galaxus and am very impressed! Search for item number 15331155, it fits perfectly!