Abstract: A plastic handle about two inches long has a longitudinal slot sized to receive a rubber band. After the rubber band is inserted into the slot, a locking pin is inserted into the first end of the rubber-band loop which has been inserted in the slot. The rubber band is then pulled back through the slot, thereby locking the plastic handle, rubber band, and locking pin into a bundle tie assembly. The second end of the rubber band is wrapped around an extension cord, rope, or the like and snapped around the plastic handle of the first end of the rubber band. The bundle tie assembly self-tightens to quickly and neatly secure the extension cord.