Lots of Shinto Muso-ryu jo students have been looking for a bag which "fits" the SMR weapons. I had a custom bag made for me by the folks at Bujin and I really like it. Several others have had the same bag made now.
My bag is: a standard Bujin katana bag that is 3 inches wider, the handle and shoulder strap moved up for balance, a large outside pocket, and the strap with the buckle (for securing the top when folded over) left off and a tab with a D ring for locking the zipper. I have packed: one bokuto, one shoto, two jo, uwagi, hakama, and change of clothes plus minimum toilet gear in this bag!!! Plus it fits in the overhead on the plane.