Why can't we keep our education on our electronic devices instead of carrying a heavy bookbag?

Teachers and principles probably still want to keep school a little old fashioned while still having little technology by the next year or 2 we'll might not have to carry heavy backpacks anymore I wish you the best of luck. 

The electronics would probably hurt your eyes after a while plus if you didnt carry a bag then you would be very weak
Just dont put too much in the bag because you dont want to hurt yoyir back