Glass with an external silicon rubber shell is likely the best. One can remove the shell and wash them both in a dishwasher. I wish a company made stackable 3

Glass with an external silicon rubber shell is likely the best. One can remove the shell and wash them both in a dishwasher. I wish a company made stackable 350mL glass containers with glass lids and silicon shells and seals. I would buy 20 of them right away and recycle my Rubbermaid "Takealongs" containers that I use for freezing food.