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ANSWER :
It is difficult to hold a School Bag having a strap made of thin and strong string because a thin string cover lesser area in force of contact in compare to wide strips which increases pressure.
EXPLANATION :
It is more comfortable to carry a bag having wide strips in comparison to thin strings as we all know increase in area decreases pressure and decrease in area increases pressure (P=F/A) . That's why we use wide strips in bags which covers more area in force of contact and decrease pressure.
We take another example of a knife...
it is difficult to cut with a blunt knife (as it covers more area) in comparison to share knife (as it covers less area).
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