The SF Muzetto bags look absolutely gorgeous. The pine trim really caught me eye, and the worn leather done right is always a nice effect. The slightest scratch/scuff on your bag won't make you break down in tears. I read a couple reviews today and they are just about pushing me over the edge for getting an MBA. So I'm a sucker for accessories, leave me alone 😀
Seriously though, the Muzetto seems to be a great case. The photos/reviews/videos all show things like putting an MBA/iPad, bluetooth keyboard, AC adaptors, wallets, iPhone, etc. all in there where it's all easily accessible. Back pouch as well with room for magazines or whatever you want quick access to.
<edit> I think the Muzetto has 2.5" of internal capacity, of which you'd be using probably 1.5" between an MBA and iPad in thin cases. Should still easily fit a scribbler unless it's a real monster. </edit>
The difficult question remains ... 11.6 or 13 😀 I seem to change my mind every day.