I leave people to sort out 'their' legal issues.... I only offer this from a practical standpoint... Look up bulletproof backpack on the web. I remember a number of suppliers that offered them a number of years ago. They were being offered when there had been a number of 'public' shootings and some people were talking about cover and concealment for 'kids' in particular. Something a 'kid' could hide behind. I'm not sure of the legal standing of owning one as a 'civilian'. But I do know that they do look 'normal' and would provide what looks like a decent amount of protection.