The image shows a 12 inch Tupperware Round Pie Keeper, also known as a Tupperware Round Container or Cake Taker. Purpose: It's designed for storing and transporting pies, cakes, cupcakes, cookies, muffins, and other baked goods. I even marinate in mine Features: It typically has an airtight and liquid-tight seal to keep contents fresh, and some models include a large tab for easy lid removal. Capacity: This round container can generally hold a 12 inch pie or up to a dozen cupcakes, depending on the specific model. 5