Hi All, Just got my new MBA and so far I'm loving it. I'm wondering about placing it in a shell or sleeve. Mostly I will have it at work and move it from my office to other rooms or buildings where I teach. Sometimes I will fly with it. I have an old Brenthaven backpack that already has some padding in it, though the sleeve is long gone and was for a 2004 Macbook anyway. Should I get a shell, just to protect it from scratching in the bag since it's got some padding? Or is it better to use a sleeve? If I go with a shell, which one adds the least weight and bulk? (that is, after all, why I got the MBA). Or is the backpack really enough? I don't mind signs of wear and tear on a computer's case, as long as the screen, etc, is clean.