Byrna Shield Armor Plate Resistant Backpack Insert - 10" x 12"Shop The Best bullet proof protection from Byrna Shiled Bullet resistant backpack body armor. Nakestores offers the best bullet proof armor TYPE 3 for adults and kids backpack. As easy to insert into a standard sized student backpack as a school notebook, Byrna Shield Backpack Body Armor is a thin, lightweight (14 oz.), flexible Level IIIA rated ballistic plate. It can withstand up to 6 hits from . 44 magnum bullets with velocities up to 1,464 feet