I have the gun on order and am supposed to pick it up tomorrow. I have already purchased a midway USA drag bag, the 56" version in olive drab. I got an insane deal on it at Christmas time as I knew I was getting the rifle . So far the bag is phenomenal. It fits my spotting spice easily(60mm). It has lots of options for carrying. Carry it like a backpack, shoulder bag, or with the carry handle. Each side is double stitched with a triple layer design. It also has snaps on the outside protecting the zipper. I will update the post when I actually get the rifle in LOL. The bag dwarfs my ak-47, but can be used as a double rifle case. I also purchased the larger of the two shooting mats. It can be strapped on the bag easily, and is awesome for prone shooting.
I concur with A14, Midway USA has a 56" drag bag, double gun with all the storage you will need. I paid $79 and it is just as good as the other brands I have and paid twice as much. I will not use it for two rifles as I use the other side for cleaning rod, spotting scope, dust rags, tripods for spotting scope. I can get all of my gear for the 338 lapua in one bag.