Plastic containers need to be easy to use, easy to store, come in various sizes, keep all liquids within, stack neatly, withstand multiple dishwasher cycles without melting or cracking, not absorb odors, and it would be especially nice if one lid fits different sizes.
Rubbermaid SilverShield Antimicrobial 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.
Where to buy (buying from this supplier supports this website):
Meathead, BBQ Hall of Famer - Founder and publisher of AmazingRibs.com, Meathead is known as the site's Hedonism Evangelist and BBQ Whisperer. He is also the author of the New York Times Best Seller "Meathead, The Science of Great Barbecue and Grilling", named one of the "100 Best Cookbooks of All Time" by Southern Living.