That's about what my basket looks like for 1 week of groceries for 3 people. I could fit all that in the Acura sedan easily.
A typical Costco run in the US looks more like this, and these baskets are larger than the standard grocery size ones.
I could get away with a smaller vehicle, but I'd need to utilize a trailer much more often. Navigating a Costco parking lot with a trailer would be a nightmare.