There seems to be unfilled divide between traditional briefcases and dedicated computer cases...

I need a solution that's at least moderately stylish (wouldn't look out of place in a business meeting), incredibly portable (minimum possible size/weight), and fits an 11" MacBook Air, and/or an iPad, with enough space left to slide in a slim file folder.

Any of you own such a thing, or have suggestions on where would be a good place to look? A quick perusal of briefcases available downtown didn't turn up anything terribly suitable.