I purchased these storage containers to be used with my daughter's new ice cream maker. I read that proper storage of the ice cream you make is just as important as precise measurements of ingredients. I love these because the rubber seal lids are so tight-fitting that you don't need to put parchment paper on top of the ice cream to keep ice crystals from forming.
I have washed them several times in the dishwasher (on the top shelf), and they still look and seal like new. Our ice cream maker makes under 1 quart. These are perfect for adding crushed candies, etc., into the ice cream before putting the containers in the freezer for the final freeze. These hold much more than a single serving, so the rubber seal keeps the ice cream tasting fresh from the machine every serving!
I highly recommend these containers!!