I am interested in your reviews on the best rolling computer bag for international travel. Cost is not an issue.

The bag needs to have the following characteristics:

Light-weight (Ideally under 12 lbs.)
Durable
Accomodate a 15" computer
Size Within International Airline Carry On Guidelines

I have looked at TUMI, Briggs and Riley, Hartman and Victorinox. Any additional brand suggestions are appreciated.

Thank you!