New adjustable Elastic (bungee) Cord Locking System. Why struggle with the ‘Powervac - zip tie’! Have you struggled with Snap on, tough to get off zip ties? Hurts your fingers while trying to remove! The new Vacbagz elastic cord locking system. Gives the flexibility, while giving the sturdiness needed, for the heavy day to day needs of these debris' bags. Use it to tie down the poles in the back of the truck too.