This is a perfect jar that is space saving and retains freshness of stored food for long time. The OXO Good Grips Pop Medium Jar 2.8 L has a pop button mechanism that creates an airtight seal. The button requires single handed operation and can also act as a handle for the jar. The jar is round in shape and has a large circular opening. It is ideal for storing cereal items like rice, flour, oatmeal etc. It has a flat base that keeps it stable. It is BPA proof.