Any chance of getting a version of this bag with the height of the MkI, but deeper to hold the double-wide Sabol foam instead of the singles? IE:16" deep instead of 8" deep to hold either a 15"x13" foam or two standard 7.5"x13" foams side-by-side. That way we can use the bag to hold larger models like the Mastodon or Storm Eagle. I think that that would be Ace and a lot more useful with all the large models GW has been putting out - especially for Heresy players.
EDIT: after discussing with the spouse, if we can get the double-deep bags I described above, then we'll want two of those plus one of the MkI bags. If not, then we'll probably just get one MkI bag to use as an airline carry-on (my spouse has one of the old Waaagh MkI bags and loves it).
Also, for those that don't know and might be influenced: the MkI bag is the perfect size for the new Delta-Airlines carry-on size restrictions (a lot of older 'carry-on' bags are now too big, because Delta tightened the restrictions) - a great thing for those who might want to fly to events.
EDIT2: The stormraven will not fit in the standard Sabol foam - it needs a double-wide foam (which won't fit in the MkI or MkII and would need the hypothetical one I proposed above). If you magnetized the wings, then you could fit it into the single wide probably, but all my stormravens are fully assembled, so I can't confirm that. Land Raiders fit fine, and Spartans should also fit (I'll double check this once mine is assembled). A baneblade will fit in the single-wide with sponsons as a very tight fit, but would be better/safer with the sponsons magnetized - there is enough room left on the foam to pluck separate spots for the sponsons as well. Fellblades will not fit unless the sponsons are magnetized.