I can't answer that, but I can say that the ncstar rug seems to fit almost perfectly, with out actuating the keys or pressing down much at all. It might be possible to put some plastic on the ends to ensure it doesn't touch. I've been using the larger ncstar with the handles for transport because it has some additional pockets for a wrist rest and a couple of cables, and I'm using a really small bag for my laptop. The rug actually fits nicely in the larger ncstar case.
Added a few pictures to give you an idea of how it fits.