Containers that can lock tightly to keep refrigerator odor out and keep food fresh. Good for storing various sauces, rice, leftovers, canned goods, fruits, and vegetables. Refrigerator, freezer and microwave safe. Airtight Lockage All passed the leakage tests by authoritative local and international institutes. 4-side of locking system of lock and lock makes it possible to be airtight due to equal pressure to all 4 sides.