So I just got a new Tumi large capacity messenger bag as a gift, but much to my chagrin, Tumi's website says it can only fit a MacBook or PowerBook 15"; it doesn't say anything about a MacBook Pro 15", which I'm going to get this summer for college. However, I put in a 15" Dell Inspiron, and it fit, though somewhat tight. I'm just perplexed why Tumi doesn't mention the MBP 15", but says the PB 15" is fine. In other words, if a PB 15" fits, a MBP 15" should too, right? I don't remember any dimension/size increases; if anything, I thought they were slimmer? Thanks! Tumi makes great stuff, and it'd be a shame not to be able to use this bag for college.