These approximately 40 ounce lunch boxes are made of sugar cane fiber that is a by-product of the sugar refining process. Boxes come with flat lids that seal well. The boxes are bleached with hydrogen peroxide and do not have any coating, so that they are biodegradable and compostable. They can be used for hot or cold foods, and are thick and sturdy, microwaveable, freezer safe, oil resistant and capable of handling boiling water. Soft white color. Pack of 50. Made in China. Eco Categories: Recycled, biodegradable, agriculturally based, less toxic. Discontinued item - sales limited to stock on hand.