Our plastic microwave containers with lids are stackable with the heavy-duty clip lid that makes these boxes leakproof. The food containers are made from polypropylene which in some cases can be reusable by the end-user and are microwave safe. Perfect for delivered food or retail, the clear plastic containers with lids make great lunch boxes that are food-grade and freezer safe. They are often used in kitchens to store dry and wet food for ease of meal prep as they make fantastic plastic storage boxes for food.