Airline pilots or travelers often secure their BrightLine Bag to their main suitcase by use of a J-hook that hangs off the front of the main suitcase. Slide the two pairs of o-rings onto the main handle of the BrightLine Bag (see the Gallery) and nestle the J-hook from your main suitcase in between the two pairs of o-rings to keep the J-hook from sliding side-to-side on the main handle of the BrightLine Bag as you pull your main suitcase around. These o-rings will keep your BrightLine Bag centered on your J-hook.