Any one using this sleeve for their beloved macbook air 13"? I wanted to buy a sleeve to carry both my mba 13" as well as the new iPad in one sleeve.. so, if you're currently using this waterfield sleeve, may I know is there enough room for that extra space for the iPad? or should I pick the 13" for macbook pro? since it is a bit thicker? I wanted to have a thin/sweet sleeve just for the macbook and iPad; no need room for other stuff. Any recommendation? Thanks guys!