I was on a short trip on the weekend and wanted to have my luggage on the bike instead of carrying it on my back. (Unfortunately, I don't have a front bag yet.)
Some detailed shots of the attachment:
During my trip I realized that my legs are hitting the rod a little. I repositioned it a little further back during the tour.
To increase the stability, you can wrap the rubber straps around the rack (behind the wheel) which will increase the tension of the straps.