Why is it difficult to hold a school bag?

It is difficult to hold a school bag having a thin strap because the pressure on the shoulders is quite large. This is because the pressure is inversely proportional to the surface area on which the force acts. The smaller is the surface area; the larger will be the pressure on the surface.



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Parents are often surprised at how much their child's backpack actually weighs. As a general rule, to prevent injury, a full backpack should weigh no more than 10 to 20 percent of your child's body weight. How a student wears a backpack is often just as important as its overall weight.

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Parents are often surprised at how much their child's backpack actually weighs. As a general rule, to prevent injury, a full backpack should weigh no more than 10 to 20 percent of your child's body weight.

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Straps being pulled down by a heavy bag can put quite a lot of pressure on your muscles, which can pinch your nerves and cause that numb/tingling sensation. Over time, this can cause nerve damage, which can take a long time to heal, and will only get worse if you continue to lug around the heavy bag.

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Backpacks are a better option than shoulder or messenger bags for carrying books and supplies. That's because the weight of the pack is evenly spread out across your body. The strongest muscles in the body — the back and the abdominal muscles — support the pack.

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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.

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Doctors recommend that backpack weight should be between 10-15 percent of a person's total body weight. If a 90-pound sixth grader carried 15 percent of their weight, the backpack should be no more than 13 pounds. An average for a 135-pound adult would be about 20 pounds.

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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.

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For instance, you're generally considered an ultralight backpacker if your base weight is under 10 pounds and a lightweight backpacker if your base weight is under 20 pounds. Most traditional backpackers will have a base weight under 30 pounds.

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