[EXCELLENT SEALING PERFORMANCE] - The airtight glass storage jar is designed with a silicone seal and a plastic lid to a perfect cup of coffee every time. Our vacuum canister effectively removes air from the canister, keeping coffee fresh for up to 5-9 days. Oxygen is one of the main contributors to spoilage and decay, by removing air and preventing food from into contact with oxygen, you can extend the shelf life of your food and keep it fresh. [SAFE & MATERIALS] - The sealed glass storage jars are made of food-grade high borosilicate glass material, which is non-, non-harmful, heat- and , ensuring safety and environmental protection while saving space and neatly organizing when placed. Our containers are stackable, making storage more convenient and efficient. [EASY TO USE] - After placing items to be stored in the canister, tighten the lid and the largest button on the lid several times until the button remains pressed, at which point a vacuum is created inside the container. When vacuum is not needed, simply the release button to release the vacuum. Simple and quick operation with good vacuum effect. [WIDE APPLICATION] - Multi-purpose glass storage jars add of sophistication to your kitchen, including coffee beans, tea leaves, grains, cereals, candies, chocolates, meats, seafood, and a wide variety of sauces and seasonings.