Generally, bulletproof backpacks with lower-level protection, such as Level IIIA, tend to be lighter. On average, a Level IIIA bulletproof backpack insert can weigh between 1 to 4 pounds.
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Bulletproof backpacks are legal for anyone in the U.S. to wear and own, as long as you're not a convicted felon or use the backpack while committing a crime.
By putting a heavy weight on your shoulders in the wrong way, the weight's force can pull you backward. So people who carry heavy backpacks sometimes lean forward. Because of the heavy weight and this unnatural position, they can develop shoulder, neck, and back pain.