This is really a great idea. The back of my truck and the back of my wife's car is often cluttered with random shopping bags. We try to keep it neater by stuffing them inside each other but it is still a problem.
The bags included are very large and very strong with stitched seams all around. They all fit very nicely in the included bag which itself is very well designed. It has a closure on the end to get a bunch of bags out at once, and a zipper on the side so you can pull bags out one at at time.
It also has a very handy carabiner clip which I snaps onto on of the headrest support for my seat. So no more digging around in the back of the truck.