CPET (Crystallized Polyethylene Terephthalate) lunch box is a type of food container that is widely used for storing and transporting meals. Here are some key points about CPET lunch boxes:

Material:
- CPET is a type of plastic that is known for its high-temperature resistance, making it suitable for both hot and cold foods.
- It is a form of polyester that is crystallized to enhance its properties, such as heat resistance and durability.

Features:
1. Heat Resistance: CPET can withstand temperatures up to 220°C (428°F), making it safe for use in microwaves and conventional ovens.
2. Freezer Safe: These lunch boxes can also be used to store food in the freezer, as they are resistant to low temperatures.
3. Leak-Proof: Many CPET lunch boxes come with secure lids that prevent leaks, ensuring your food stays fresh and mess-free.
4. Durable: CPET is a robust material that resists cracking and breaking, making it ideal for everyday use.