Question

why do school bags and shopping bags have a broad straps as handles

Answer 1

Heya friend here is your ans

It is because higher is the surface less is the pressure and lesser is the surface more is pressure applied....

Hope it helped you

Answer 2

they have broader straps to increase their surface area which decreases the pressure on our shoulders as area is indirectly proportional to pressure so when surface area increases, pressure becomes less. Thus, it does not causes pain in our shoulders.

Hope this helps! :D