read it properly and believe it.
and this is what the spokesperson of The Foundation for Chiropractic Progress said :
He recommends using a bag with two shoulder straps or pulling a carrying case with wheels if you must take heavier items with you but it is important to know that when it comes to health, less is always better. "Heavy, cumbersome bags may leave you with back, neck, and shoulder pain, even headaches and can aggravate or accelerate arthritic conditions
i have a handbag that is already heavy (about 500g) even when you put nothing in it.
and i use it when i attend my daily class..
just imagine how much it weight when you put your pencil case, your notepad, your umbrella and you drinking water..
urghhh!!
and nowadays, i decide to wear backpack for my daily classes.
it save for my spine. :)
footnote : teringat lecturer fizik haritu. "It is MASS! not WEIGHT!!" hahaha!!