I have been checking out cases for my macbook as I have another post out here. One of the cases that looked interesting was the Brenthaven Metrolite II. It says it flexes to fit both the 15.4 MBP and the Macbook. My question is obviously the MBP is larger so it may fit it better and thus the MB might move around quite a bit. Does anyone have this bag, and what do you think? Thanks!