I walked into work the second day I got my Air, back when a pillowcase served as a sleeve, and a friend handed me a standard padded envelope - except that it's rough cardboard paper on the inside as well. Since I'm waiting for my SFBags Suede Sleeve, I'm too cheap/lazy to get a more decent case, but I've found myself really liking this envelope. It's extremely discreet, and since it's so light, you can really hold it any way you'd like, as if all you have is paper inside. And you can pull it out without anyone really noticing where it came from, since no one cares about paper documents. Or, if you want to impress people, you can plop the envelope on your desk, then slowly and deliberately pull out the MacBook Air, and it's like "what up!" in a Phil Dunphy voice. I'm just worried about one thing - will prolonged use of the rough envelope scratch the hell out of my aluminum?