I have the Kuyakyn version of the Saddleman 3400. I use Motorcycle ROC Straps to strap the bag onto the passenger seat.

I shortened and sewed the longer, adjustable, "male" plastic clip side of the strap to allow me to permanently attach them under the grab rail at the bolt mounting. The pictures show the clip out and the clip tucked away.

The shorter bungee ends simply stay hanging on the bag, always ready to go. The weak point is the plastic clip. I've used this setup for several trips and haven't had a single problem. I bought another set of ROC straps which I use to strap things down on the luggage rack.

ROC Out.jpgROC Tucked.jpg