Freezing foods in plastic containers isn't as worrisome as heating them, but if you're leery of plastic, glass containers designed to withstand large temperature extremes, such as Ball Jars (aka Mason jars), like the one pictured here, or anything made by Pyrex, can be a sensible alternative. Just be sure not to load them to the brim as some foods expand when frozen.
Photo credit: Johnathunder, Wikipedia.
ear EarthTalk: I love to cook and when I have the time I make soups, stews and pasta meals in large batches and freeze them. I use leftover plastic containers, but I know this is not good. What kinds of containers are safe for freezer food storage?
-- Kathy Roberto, via e-mail
Reusing leftover plastic food containers to store items in the freezer may be noble environmentally, but it might not be wise from the perspective of keeping food safely frozen and tasting its best when later heated up and served. Many such containers are designed for one-time use and then recycling, so it’s not worth risking using them over and over. Likewise, wax paper, bread wrappers and cardboard cartons should not be used to store frozen foods; these types of containers don’t provide enough of a barrier to moisture and odors and also may not keep food fresh when frozen.