The White Gamma Seal Lid converts plastic 3.5 to 7 gallon buckets into airtight storage containers. This works well for storing everything from food such as rice and flour, pet food to paint and shop needs. Anything you want to keep fresh and airtight will be well stored in a bucket with a Gamma seal lid. The patented Gamma2 Seal Lid uses two gaskets to assure an airtight and leak-proof seal. The Gamma seal lid is proudly made in the USA from BPA free, food grade plastic.