Top 6 Best Airtight Containers For Flour And Sugar [Apr ... This set consists of three crystal-clear containers in three different sizes: 3-1/2 cups, 5 cups, and 8-3/4 cups, which is flexible for storing various items. It can be craft supplies, utensils, foods, or baking materials. Particularly, they keep flour and sugar airtight thanks to the added gasket to the lid.