What are the dimensions for the padded section on the Ristretto for 13" Macbook/Air? I'm wondering because I'm starting to be swayed into the 13" Macbook Air camp, and using my Ristretto for iPad no longer will be an option (You can fit the 11" MBA into the iPad Ristretto.) I'm slightly concerned, because if a 13" Macbook Pro can fit into the padded compartment, then obviously (or at least I think obviously,) there is going to be an excess of wiggle room with an Air in there. Will I be forced into getting a cache for it? Does a 13" MBA in a cache have a fairly secure fit in the compartment?

Thanks in advance,
Zach