I received my waterfield sleeve in the mail today (www.sfbags.com). I chose this one in part because they were the first as far as I know to make a bag specifically for the new aluminum MacBook which is a bit more than a tenth of an inch thinner than the whitebook. It's a local (to me) San Francisco company with very personable service, ie. I got an email from the owner when I ordered the bag. Service was fast. The bag is attractive and very solidly constructed with some nice details like a strap at the bottom hold on to while pulling the notebook out. It fits the aluminum MB like, well, a sleeve. I first bought the neoprene incase sleeve which is a one-size fits all for the old and new MB...it's fine but it's loose on the new machine. This one is a custom fit. It's not cheap but for those willing to pay for thoughtful design and local manufacturing, it's a good choice.