I've had my mono GM nf for 5 years and I LOVE IT !!!
It's my favorite bag after all these years .
I don't think it's heavy at all. ( when I travel and put my iPad in it and 3 hoodies than it feels heavy,)
What do you carry in it that makes it heavy?
I carry my LV insolite wallet , my mono LV checkbook cover ( no checkbook just for receipts), a card cubby ( for all my store cards and gift cards ) ,
a small makeup bag for lip glosses,a small makeup bag for lotions and hand gel). A small container for my migraine pills . My key Cles and cell phone ( sometimes I put them in my pocket.)
I did buy a bottom for the bag to give in shape but it made it heavy .
I haven't tried a purse organizer yet ,probably bc I love the interior striping too much to cover it up !