LOCK & LOCK 16-Fluid Ounce Rectangular Food Container with Tray, Butter Keeper Airtight Lockage Odor resistant Heat-resistance Premium Microwave(for heating up foods) OK & Sterillzation in hot water OK, Freezer Ok Passed the leakage tests by authoritative local and international institutes. It has passed the KEMTI's bending test. The container and the wing were fixed the bending test machine and bent 1.9-Cup/15-fluid ounce Made of high quality BPA free plastic Airtight seal with great elasticity power locks tightly with hollow-center silicon Microwave, freezer, and top rack dishwasher safe