The new multi-purpose boxes are ideal for clean and safe keeping fresh of food. They are also perfect for transporting, storing,keeping fresh and freezing food. Thanks to special silicone seal the GKW WIN boxes are air-and watertight. Four convenient clip closures secure the contents of the box. There are also little ridge in the bottom of the container that hole your food up, and off, the bottom of the container so that the food is not sitting in liquids which also helps keep your food fresh longer.