Buy a bulletproof backpack from BACKPACK SHIELD Mfg. it's the highest handgun
ballistic resistance (NIJ level IIIA) rating - Being "PROACTIVE" vs. passive against unexpected violence is up to you. The BACKPACKSHIELD tm ~ like wearing a seat belt in a car accident there is No Survival Guarantees when your being shot at. A little bit of protection can go a long way, it might even save your life. The bullet resistant Backpack Shield is meant to defeat handgun rounds. The ultra light  BACKPACKSHIELD tm measures just under 17" high by 11.75" wide, is ~3/8" thick, and fits inside the back/rear compartment 1000's of standard size (ie High School & Collegiate
WALMART, TARGET) backpacks.

backpack Backpack Shield