My tail bag has bungees that form loops, instead of the single cord with a plastic hook that seems to be more common these days. (It also has hooks that can be used with it, I just don't use them.) I wrap the front cords around the front bungee spools and the back cords under the grab rail and then around the rear spools (or when the Ventura rack L-bars are on, the rear of them, under the knurled rack screws). That keeps the bag from wanting to move anywhere.