http://www.amazon.co.uk/Swissgear-GA.../dp/B000NONHYY
I bought a Wenger very similar to this when I needed to carry a laptop in a situation that didn't lend itself to carrying a briefcase or using a rolling case. (I think mine may be a slightly older version.)
It has been wonderful - Mr H has adopted it as his hand luggage of choice - I sometimes have to fight him for it!
We have carried two laptops in it, and a lot more as well. They also do another one that will take a 17" laptop.