All passed the leakage tests by authoritative local and international institutes4-side of locking system of lock and lock makes it possible to be airtight due to equal pressure to all 4 sidesDurabilityIt has passed the KEMTI's bending test. The container and the wing were fixed the bending test machine and bent.Healthful LivingUsed superior raw material with durability and heat-resistant ability Passed the strict hygiene and safety tests of U.S. FDA and German SGS.Space Saving Design Use and CareWash before useTop rack dishwasher safeDo not use abrasive cleaners and scrubbersSilicone seal can be removed for cleaning if necessaryDo not use a sharp object to removeMicrowave Use and CareUnlock all four latches and loosen lid before use in microwaveThe container base and lid are microwave safe for reheating purposes onlyDo not use lid or base in oven, under browning elements or on stove topAvoid overheating food high in oil, fat, sugar, or tomato content to prevent permanent stain, pitting or other dangers associated with high temperature.Safety cautionsWhen using the microwave, be sure to keep all of the locks open Store food in a container after food has cooled offBe careful especially when you open a container containing hot food to avoid burnsNever store alcohol, benzene, gasoline, oil, or other volatile or flammable chemicals in your containers