Torvol Quad Pitstop Bungee Hook

I received the Torvol Quad Pitstop backpack for Christmas and I wanted to be able to add a quad to the back of it if needed. I didn't want to do any permanent mods, and I wanted to keep it simple so I just came up with a hook that goes over the existing buckle straps. The hook is designed for 5mm elastic cord (Purchased from WalMart in the automotive section - "Hyper Tough 10-Pack Canopy Tie Set"). Two copies of the hook are needed. Sliding the buckle through them to get them on the side straps is a tight fit, but it will work with a bit of stretching. When I'm not using the elastic strap I just store it in the backpack but leave the hooks on the buckle.