RitePak MFPP Hinged Containers provide a durable, convenient, eco-friendlier alternative to foam containers. Microwave-safe, freezer safe and cut-resistant. These containers snap closed for an excellent seal. Suitable for both hot and cold applications. Made from mineral-filled polypropylene (MFPP) that uses 40% less resin than comparable items, making it an eco-friendlier option to traditional polypropylene containers.