It is quite a big space for shopping bags to roll around in. I ended up getting some foldable plastic crates online and storing them in the small compartment under the main trunk/boot space. I just take one out and unfold it when I need it. Still shuffles around in the boot though but not as annoying as having fruit and veg falling out of a bag and going on their own mini adventure whilst you're driving home.
Also useful for doing smart scan in the supermarket.