I use only to keep food in, in the fridge or freezer.
I buy a good brand too.
Never use them the re-heat food.
It may not be safe,or ruin the container.
As with the one in my pic, that had rice
in it....Some plastic containers can not
be used, in the re-heating process.
I do. I try to buy those that a BPA free. Like meggf, I would prefer glass, but they are expensive. I sometimes store food on plates and cover them with cling wrap - but that is not environmentally-friendly and makes me feel very guilty.