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

Carrying a school bag with a strap made of a thin and strong string can be challenging due to specific factors:

1. Pressure Concentration: The thinness of the string causes increased pressure on the area where it rests on your shoulder. This concentrated pressure can cause discomfort or even pain, especially when the bag is heavy. It may create visible marks or soreness due to the higher pressure applied to a smaller area.

2. Uneven Weight Distribution: Thin strings lack width or surface area to distribute the weight of the bag evenly across your shoulder. Consequently, the weight concentrates on a smaller surface, leading to increased pressure points and discomfort.

3. Cutting Sensation: In cases of extremely thin strings with a heavy bag, it might feel like the string is cutting into your shoulder due to the concentrated force. This sensation can be uncomfortable and can make carrying the bag for extended periods difficult.

4. Strain on Material: Although the string might be strong, the intense stress placed on a thin string by a heavy load can potentially compromise its durability over time. This strain could cause the string to wear out or break more easily, posing safety risks and the potential for the bag to fall.

In summary, while a thin and strong string may offer durability, it might not distribute weight evenly or provide comfort when carrying a heavy school bag. Opting for wider straps or those made of padded materials can help distribute weight more evenly, reducing discomfort and strain when carrying heavier loads for extended periods.