I want a bag that I can use daily to carry a 13" Macbook Pro,a GPS,a handgun,radar detector,ipod and a bankbag. I only fly about twice a year. I have looked at the Empire Builder, Checkpoint Flyer and Brain Bag. I have considered ordering all 3 and returning the 2 that don't work. I would prefer not to do that. Any and all opinions as to which bag might be best for me would be greatly appreciated.