Underneath the zipper inside, an additional bar, so that the teeth of the zipper can not damage the edges of the laptop.
For me very important: the opening of the bag is attached to the small side! Since my laptop is constantly taken to the university and is in the pocket between the legs in the lecture, I thought it was great, simply open the zipper and pull the notebook directly from the bag, so my Neoprensleev constantly remains in my shoulder bag !
In terms of size, it fits as I said very good for the ASUS U30SD aaaaber also good for Macbook Pro 13.3 "!!! This fact has a fellow student, the bag has also liked and she has tried. He has to also bought and we both noticed that the bag "adapts" after a short time the shape of the laptop.
For example, my ASUS is a little thicker than the MacBook, but has competition from Apple almost a centimeter more in width on the ribs. When inserting the first time acts all still pretty tight, but after only one week, the bag is deformed so that it fits the laptop perfectly.
Strong buy recommendation !!!