If you want to run Hard Plates on the side securely they make these 2 pc set for condor rigs to accept hard plates on side securely
https://www.opticsplanet.com/condor-vas-side-plate-insert-2pcs-per-pack.html
To Mike B: Thanks, your response was slightly more useful than a COVID expert's. To anyone interested, it can hold 6x8 side plates but will not velcro shut. Not really a big deal as they will not fall out but I wasn't really a fan.
This is a plate carrier so it is ready to carry plates.