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Why is it difficult to hold a school bag...

Why is it difficult to hold a school bag having strap made of thin and strong string?

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We known that pressure `=` force/area. When the string of the school bag is thin ,its area is small and as such the pressure exerted on the shoulders or the hands supporting the bag is large. In this case, the force acting on the shoulders or the hand which supports the bag is equal to the weight of the bag. In case, the strap is broad (as is usually the case), the area on which the force (weight of th bag) acts is large and the pressure is reduced (as the weight of the bag is now distributed over a larger area).
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