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