My best friend is itsy bitsy...doesn't even top the scales at 50kg....
she gets sooooooooooooo annoyed being charged excess luggage....
She will be very happy with this news....she finds it very unfair...
i think you and your bags should have a cumulative weight.
Oh an I think you should get rewarded with extra air miles or something if you are under weight...

last hols I took 5.9kg :)