Explain why, school bags are provided with wide straps to carry them

It is known that surface area is inversely proportional to the pressure.

Thus, school bags are provided with wide straps to carry them so as to increase its surface area.

When the surface area will be increased the pressure on the shoulder of the childerns will be decreased.

Thus, to decrease the pressure the school bags are provided with wide straps to carry them

School bags are provided with wide straps to carry them to decrease the pressure.