The new food storage sets are made from a thick and durable BPA plastic. Easy to store all foods to save up storage up and keep foods fresh for the day. The containers are able to hold liquids and allows for east pouring. Push the ring back up and it acts as a handle to lift the whole container lid. Lid-lock mechanism - Once the ring on the lid is pushed down, the silicone seal inside the lid will expand to seal the jar creating airtightness. Pop the ring back up and it serves as a handle to lift the lid. Provides maximum freshness and prolonged food storage.