The safe and durable plastic container. The hollow silicone gasket and four-sided lid locking system provide excellent airtightness. Thanks to its long service life, the lid can be opened more than three million times. The unique patented The safe and durable plastic container. The hollow silicone gasket and four-sided lid locking system provide excellent airtightness. Thanks to its long service life, the lid can be opened more than three million times. The unique patented air hole makes these containers airtight and leakproof. PP material makes the containers a safe choice for use in the microwave and dishwasher.