Keep A Few Different Sizes on Hand
Plastic containers need to be easy to use, easy to store, come in various sizes, keep all liquids within, stack neatly, withstand multiple diswasher cycles without melting or cracking, not absorb odors, and it would be especially nice if one lid fits different sizes. Rubbermaid Stain Shield Containers meet all my criteria. One word of caution: I always remove food from plastic containers before microwaving. I am just not convinced that the plasticizers and other compounds in these things are perfectly inert and harmless when heated.