Does the IA16 come with the draft box or is that an add on price?

The reason I ask is that the Felt webpage does not list it in the details, but does show it in the pictures. And I wonder how much storage space it has compared to the Bontrager draft box, which I have seen on several Felt's looking at Google images. The Felt version looks slightly smaller. I do a lot of longer solo rides/training and carry more items. Currently I have all this stuff crammed into and velcro'd on the rear hydration and top tube pack. I call my Felt, The Mule, because I have so much crap on it for emergencies. I sure would like to clean up some of this on the next bike.

If Felt's version does not come with the bike I think I would rather order the Bontrager version. Random Felt Picture on Slowtwitch.

Edit: Two weekends ago under the "You ain't gonna fix that" category, my SRAM Red rear derailleur spring broke 40 miles from the car in the middle of nowhere. Fortunately I had no problem getting back. It just took a lot longer setting the chain mid cassette and using the front chain rings to have a 2 gear selection. I doubt I will be packing spare rear derailleurs in the draft box. :-)