TUMI Messenger Bag
I bought this TUMI bag for my 4760. It is a little bit pricier(~180$) but it is a very solid bag. The computer sleeve fits the 4760 like a glove (it has zippers on the side that increases the width) although it states on the site that the max is 14.5. TUMI Messenger Bag
It provides very solid, not perfect, protection for the computer. It already had a good test when the sales lady accidentally knocked it off the counter (computer inside!!) when I was trying it out (approx. 4 feet drop). No damage whatsoever.
The only downside is that there is scant protection in the upper corners. You can kind of see inside when you have the bag closed because it is a messenger bag (see link). Tumi also has a nice tracer program for all their bags that you can register for.