I don't like the factory floor net, it doesn't work well for larger items or things that you just want to keep upright in the trunk, like a grocery bag, so I decided to rig up an envelope style cargo net that will do the job.
Purchased the net on Amazon:
link
Next, and this is optional, modified the hooks and thinned them out a little bit with a utility knife so it's easier to hook them to the side pockets. You don't have to do this, it just makes them a little easier to attach.
Last step, attach the bottom hooks to the side pockets, and slide the top loops over the side hooks.
The net works really well, I can easily drop a grocery bag in and it stays put, or my backpack, or any small items. Very easy to set up, and completely reversible.