I use them for freezer containers, no freezer burn like those "so called" freezer bags that fail within a week. Straight from the freezer to the fridge, and sometimes the oven, they just wipe right clean except for the lids which I wash with dish soap just to make sure they are extra clean and so easy to store. thanks to these and my other Pyrex dishes, I have thrown all my plastic bowls in the recycling, and they are great for keeping food warm, or cold longer for outdoor activities. I just wish the package was offered in larger quantities.