Craig,

Go to a good hiking store. Pick up a 1" nylon strap with a quick release buckle. You could use a heavy duty needle and thread to stitch the strap to the bag. Then the storage container attaches with the strap buckled behind the seat (a bit like a fanny pack for your seat). If the strap is too thick to stitch, you could stitch a couple of nylon belt loops on the bag. Thread the strap through the loops and clip the strap behind the seat. Easy in, easy out.

I also like malpaso's "Cab Commander" too. Put that baby on the front of the seat.

Don't forget to pick up a set of seat back organizers. Both our vehicles use the seat back organizers. I had to use a large safety pin on the headrest straps to shorten them (l like the organizers mounted high for easy access). On the bottom I remove the "shoe laces" and replaced with mini bungee straps. This keeps the organizers snug to the seat, but allows for easy removal.

You can never have too much storage in your vehicles. If I had my way I'd be driving a 4X4 UPS truck!

Good luck, TR