Question

why is it difficult to hold a school bag having a strap made up of a thin and strong string.

Answer 1

  It is difficult to hold a school bag having a strap made of thin and strong string, because the thin string has very less contacting area in case of a school bag having a strap made of thin and strong string which increases pressure which is un comfortable to carry the school bag.

Answer 2

It is difficult to hold a bag of thin strap because it covers the small surface area and put a lot of pressure and stress on our shoulder.
Thus we prefer wide straps of the bags, which reduces the pressure.
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