OK, so in my (neverending) search for a bag for my PB, I've decided that a backpack is what I need. Now I just need suggestions. I need it to meet the following requirements: 1. Hold my 12" PB well. 2. Hold 4 high-school textbooks. 3. Have extra compartments for gadgets, pencils, iPods, etc. 4. Be comfortable for commuting. Any suggestions? NickD EDIT: OK, I think I'm pretty serious about the Swiss Gear Maxxum. Anyone have any testimonial with this bag?