I have had my MBP for over 2 weeks now and I have had an Incase sleeve its not really a true sleeve as it has pockets and things but I have been very impressed. in the pictures on the apple website there is a shoulder strap but I have not put this on it yet as i do not feel the need. Although it being slightly more than a sleeve it is perfect for putting in and out of bags.
I would give it a 9/10
http://store.apple.com/us/product/TW208ZM/A?fnode=MTY1NDA2Ng&mco=MTA4MjU1OTY
I would give it a 9/10
http://store.apple.com/us/product/TW208ZM/A?fnode=MTY1NDA2Ng&mco=MTA4MjU1OTY