actually, most of guys who carry their girls' bag look very young. tipong teenager lang. I understand they want to be of service but duh...it's so small. I highly doubt a girl's bag could weigh more than a kilo.
i think, to guys: if a bag looks awfully heavy, you could offer to carry it.
to girls: utang na loob, wag magdala ng handbag if ipapabuhat sa iba.