Ziploc facing class action lawsuit over alleged undisclosed microplastics

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9. Butcher paper was mentioned and "freezer paper" is similar - both have a "coating"

I would think wax paper might be another option where if the food was solid, it could be wrapped in that and then put in the plastic container.

I normally use one of those "food saver" type machines that have sealable plastic bags and am not sure if anyone has actually tested those.

But I have actually frozen stuff in foil pans and wrapped them in aluminum foil. Some packs of foil pans come with cardboard "lids". You can do solids and semi-solids (like casseroles, etc) in those.