I stumbled on these white soup containers after reading a forum thread about freezing and reheating meals safely. Someone mentioned paper containers with vented lids, so I ended up at https://mcdonaldpaper.com/safepro-sp101-16-oz-white-paper-soup-containers-combo-with-vented-lids-250-cs/. I liked the clean, simple look. I tested them with tomato soup, and the container stayed firm even when hot. They stacked well in my fridge, which made organizing leftovers easier than usual.