So I have had the Macbook Air 11" for the longest time, and the screen quality has finally gotten to me and I bit the bullet and bought the 13" macbook pro retina. Now I need a new neoprene sleeve. I see some market a 13" air sleeve as fitting the mbp retina 13" but is that reality? I have a tucano second skin for my macbook air 11", and love it because it's so minimal.
If you want minimal, check out the link below.
http://picasolab.com/store/index.php/macbook-air/macbook-air-13.html
I have ordered 2 cases through the site, a 13 inch Air case and a 15 rMBP case, and both are extremely high quality and they both have my name engraved. The leather is really nice, as well. My favorite cases for Macbooks by far.