The Bullet Proof Square Pad is an insert, directly designed to go inside of a backpack or notebook. It was designed to protect your vital organs in case you may come in contact with an armed gunman. This product can be sold up to 5 feet but 8 feet. It is an eighth of an inch thick and has been tested in numerous situations. The Bullet Proof Square Pad has been tested with 22 caliber, 357 and 44 magnum including shotguns with a multiple hit capability. Its even been tested with multiple hits of a 44 magnum within the same hole. So if a gunman shoots 3 times in the same hole, your still protected. The square pad comes in standard notebook sizes (8.5x11 ¾) and has an insert for a backpack that is 11” by 14”.