Just got a new 17" G4 Powerbook and a new Brain Cell, size 1. I would suggest thinking about making it 1/8" thicker. With my old 14" iBook I was able to slip a few file folders in with the laptop with relative ease. The new one is rather snug, making it a force.
Or perhaps, my old one was compressed over time and thereby creating a bit of room.
Just a thought.