Even when they had plastic bags here, I’d be surprised at how little they’d put in some bags. Those things can handle more, fill them up!
That’s the part I like the best about self checkout. I can set up a couple of bags and then optimize what I scan. Put all the freezer stuff together, fridge stuff, soft things on top, heavy stuff at bottom. Helps that they got rid of the weighing where I shop, that shit was so annoying plus it limited your total space to however big the weighing table was (unless you got someone to reset it so you could remove some bags back to your cart).