Kriega bags are on the market for a long time, and that's for a reason - top quality and great design. One of my favorite design features is unique mounting system. Kriega OS-rack loops are bolted to the bike or to the rear rack. Than bag is attached to the rack loops using straps with g-hooks. This makes mounting and dismounting a breeze.
To make all this even more convenient, there are six pre-drilled countersunk holes on our KTM 790/1X90 Top luggage rack, designed for Kriega rack loops. Rack loops are mounted on the underside of the rack, using M6 countersunk bolts. This way, top surface of the rack remains completely flat and rack loops barely protrude through slots, just enough so g-hooks can grab them.
This is how it looks from bellow.
Size of the rack allows it to easily accommodate larger bags too. Here is how Kriega US-20 bag fits.