Amanda Curran, 18, daughter of Bullet Blocker inventor Joe Curran, demonstrates how to use a child’s bulletproof backpack in the event of a shooting outside of Curran’s home in Billerica, Massachusetts December 19, 2012. The child’s bulletproof backpacks range in cost from $250 to $600 depending on the size of the backpack. According to Bullet Blocker Vice President of Business Operations Elmar Uy their products stop 99.9% of bullets from all handguns.