I decided a couple years ago to switch to mostly glass food storage containers. I buy them on sale and use them for left overs. They can go from fridge to freezer to microwave.
I still have plastic containers for storing bulk dry goods, such as flour and sugar.
I also use Mason jars for food storage.
You can put glass containers in the freezer as long as you leave enough room for expansion. If I am using a jar, I fill to an inch below where the top narrows, so there is lots of room for expansion.