OK these lids are amazing. They create a tight seal around containers of various size. That means (1) your leftovers are fresher, (2) your drinks don't spill, and (3) you don't need to waste any more plastic film or foil. The stretchy, silicone lids come in six sizes that fit around both square and circular containers measuring 3 to t10 inches. And, yes, they're freezer- and dishwasher-safe. $13.