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What type of force does a backpack exert on the body’s back and hips?

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User Anttud
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So how did that other answer get verified?

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User James Kyburz
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The backpack's main force that it it is exerting on the body's back and hips is coming from gravity, and can pull the spine downwards. This is why it's important to ear both straps. 
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User Revious
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