Store fresh ingredients, meals and leftovers in fresh food boxes from our Sigma home collection. The flexible lid seals airtight so food stays fresh. Organize your refrigerator neatly with these perfectly stackable fresh food boxes, available in a variety of colors and sizes. They can withstand temperatures from -40C to 120C. So suitable for use in both the freezer and the microwave (when used in the microwave, please remove the lid first). BPA-free and therefore 100% food-safe and also suitable for the preparation of (baby) food.