Bulletproof backpacks are becoming more and more common as parents seek ways to protect their children from potential school shootings. Sales of the special packs are up 300% as the new school year approaches. The backpacks are rated IIIA, claiming to stop bullets from a 9mm handgun to a .44 Magnum. But do they actually work? With the help of Taran Butler, owner of Taran Tactical Innovations in Los Angeles, Inside Edition put them to the test.