I finally found a sleeve that is suitable for my MBP13 this evening. Its from Case Logic and they have new precision sleeves specially made for the MacBook 13". Price is RM90 (Midvalley). I like the inner feature where they have linings to protect the MacBook from scratches originating from the zip. As you zip the sleeve close, the linings will move together to cover the MacBook and protect additional side impact protection.

Here's the product page: http://www.caselogic.com/13_macbook_laptop...?modelid=120446