it'll fit containers of most shapes, not just round ones), but it's best suited for round bowls between about 2.6 to 12 inches in diameter. Because the lids are transparent, you can see exactly ...

The set comes with 10 containers that range from 1 cup to 4 cups in volume size. Each round glass bowl comes with a flexible airtight lid that you can stack in your fridge, or take with you on the go.