an incase "vertical sling".
i was originally looking for just a low-profile sleeve, because i already have a n acceptable bag that i carry all of my school crap in... but i didn't find any that i liked. So i just went to the apple store and found this incase. I'm really happy with it. the 15" MBP fits nice and snug in a VERY cool plush fur -padded pocket, and it has plenty of pockets for accessories and a few small books or notebooks.
the only thing i wish it had was a small hand-handle at the top or side... when you take it off of your shoulder there's not much to grab onto.
anyway, i'll let you know how it holds up.