never understood why the CX-5 doesn't have one, I've seen the OEM flat cargo net but find it useless for grocery bags.
so I installed a vertical cargo net myself, extremely easy, some drilling is required. I popped the tail light access panels to make sure
I didn't drill into any wiring and also to install the flat washers and nut, see pictures and link.
I find the vertical cargo net very useful for grocery bags, hanging wet towels after swimming, etc.
The CX-5 already has loops on the bottom side, I only had to install the two top net hooks ($1.99 for 4 pack)
The set came with self tapping screws but I replaced those with a bolt and nut instead which is less prone to failure
than the ones that just screw into plastic.
I had an existing cargo net from a 2005 Highlander but you can get universal cargo nets on Amazon.
http://www.ebay.com/itm/232056187934?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT