Thank you fietsbob. I am working with it, trying to find ways to mount it on the rack in a way that give me the flexibility of just clipping on the u-lock, or in the event that I want to put both bags on, that the mount allows for the bag to be put on and the lock can be thrown in the bag. I also have my fender rods coming up in between the wheels and the rack so while there is likely a way to squeeze it in between the rack and the wheel, that does make that a bit more complicated.