Links I sent to my wife last week. Same line of thinking:
https://www.ar500armor.com/ar500-armor-body-armor/backpack-armor/ar500-armor-rimelig-11-x-15-backpack-iiia-soft-body-armor.html
https://www.lapolicegear.com/ar500-backpack-plate.html
https://www.ar500armor.com/ar500-armor-body-armor/backpack-armor/ar500-armor-rimelig-11-x-15-backpack-iiia-soft-body-armor.html
https://www.lapolicegear.com/ar500-backpack-plate.html