LOCK & LOCK 33-Fluid Ounce Rectangular Food Container, Tall, 4.1-Cup Airtight Lockage OK & Sterilization in hot water OK, Freezer Ok Passed the leakage tests by authoritative local and international institutes It has passed the KEMTI's bending test Passed the strict hygiene and safety tests of U.S. FDA and German SGS 4.1-Cup/33.8-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