The Evak Storage Containers work by removing all air from the container in order to keep your product as fresh as possible. To remove air simply push the lid down as far as it can go without crushing your product, it’s as simple as that. Made with 100% borosilicate glass and stainless steel your product never comes in contact with any harmful plastics. Are you tired of your product drying out too fast? Invest in an Evak today!