BECAUSE IT IS FULL OF SHIT.
Like a lot people's purses/backpacks/bags.
Still, assuming he's holding it for her due to it's weight is just that...an assumption. I brought this up to my wife and she agreed that the solution for her would to be to not put so much stuff in her purse. I would hold it for her if it were too heavy, but after that one time I'd say we should go over her purse-packing priorities. .
So if she inconvenienced you more than once you'd want a say in what she was lugging?
That's not what I said. I meant that I would be concerned as to why her bag is too heavy for her. She's not always going to have me there to hold it for her, so we should see what we could eliminate to make it easier for her in the future.
Seriously, the level of words being put into mouths here is obscene.