I use my own shopping bags. Have for years. I keep them in the trunk of my car so I always have them with me.
Every time I grocery shop, I tell the cashier, “Please don’t make the bags too heavy.” And every time, the cashier loads as much as s/he can into each bag. It’s not as if I am costing the store money by using too many bags. I use my own. I’m saving them money. I say please. I’m nice about it.
When you’re short and already can’t deal with the too-tall shopping carts, lifting a too heavy bag is painful. We’re supposed to lift from our knees, not our backs. Not in my supermarket’s parking lot.
Even worse is when the cashier in his/her zeal to cram as much into each bag as humanly possible starts crushing my popcorn and chips to make the packages fit. I had to tell one last week, “Stop crushing my chips!”
So yes, this is a pet peeve of mine.