I've always appreciated Brenthaven for classic black bags and clean, professional lines, but I was pleasantly surprised to see the Collins collection recently. The gray fabric with a slight grain and dark trim are a killer combination, and the fit of the sleeve is perfectly snug. For the most part I'll carry my Collins sleeve in my purse, but it looks so nice I may carry it alone from time to time.
As for protection, I don't plan on dropping my MacBook any time soon (who does, right?), but the sleeve is well padded and the striped lining provides a soft, scratch-free home for my laptop. Overall, this sleeve is a huge home run. I just realized that Collins comes in a beautiful Indigo blue, so I may have to buy two!
Size suitable for MacBook Air 13., fits quite well. The outside texture is nice, however the fabrique itself and the cushioning do not appear very protective.
In my view the zipper is a constructional defect: For better optics the zipper was sutured in inside-out, so that the little zipper ribs are pointing inwards, potentially scratching the notebook edge.