I have one of the Tamrac Cyberpaks (maybe 7 or 8? ; I'll check the number when I get home). ; I like it, but I found that with the front pockets fully loaded, I had trouble stuffing it into the overhead bins. ; On the smaller regional jets, it won't fit in the overhead bin and I had to unload the front pocket completely so that I could barely stuff it under the seat in front of me. ; I still think its a good bag, and will probably be using it to transport my gear to Pixelmania this year.
I also think that Think Tank bags are worth looking at. ; I don't have any of their camera bags yet, but I just bought one of their laptop bags and I love it. ; It has more room than my old one and the quality of materials and construction are excellent.