The Belkin Neoprene Sleeve (15,6") is made of a very good material and thin. Good for storing, more than to carry it around. However, bear in mind that is too big for a Sony Vaio 15,6". The reason fot that is that most Sony laptops are a 16:9 scale, which makes them wider and narrower than other laptops. Since this case is for regular size 15,6" laptops, when I put in my Sony it was almost 2 fingers narrower.
Because of that I gave it out and bought the Targus Sleeve, which is the same size, but due to the good caushion it fits perfect to my Sony Vaio, and compensates the extra 2 fingers.