So I wasn't sure what size to buy for my laptop because I have a 14 inch HP Elite book and I wanted to that it fits in your pocket. I ended up buying both the 12-13.3 inch size and the 13.5-15 inch size (first two pictures). 13.5-15 inch was too big but 12-13.3 inch is perfect for my laptop. This is a great quality case and it is exactly what I wanted!