It is designed specifically for the 13" Macbook Air (They make the 11" size also) with a great fit and nice padding for protection against bumps and scratches.
Available at Amazon: http://amzn.to/zrGICm
Read the full 13" Macbook Air Fug Review
The fug is very simple and does exactly what it is supposed to. It is made of very high quality material and craftsmanship.