The multifunctional boxes have proven themselves millions of times and are indispensable in households. For many years, they have brought order to food storage. The patented four-wing safety closure with silicone seal ensures 100% airtight and watertight sealing. Stored food stays fresh longer, and odors cannot escape. All boxes in the Classic series are stackable, and the various sizes fit perfectly together, creating up to 40% more space in the home. The containers are made of polypropylene, which is free from harmful BPA and is easily recyclable.