John
All great point but when I travel with my full Lowepro backpack on regional jets, I have been able to avoid checking the bags by bringing them out to the gate and checking at the point of boarding. This avoids baggage handlers and keeping better track of my gear. I will do the same with my P4.
Yes, good point. Checking at the gate is usually kinder handling, since you would typically pick up your backpack at the destination gate, avoiding conveyer belts.
The Boeing 717 regional jet has adequate overhead for standard 14x22x9" carry on bags. The Bombardier RJs are the problem, along with any prop commuter, like Horizon Air uses in the northwest.