Kraft paper lunch boxes can only be heated for a short time, not for long periods of time. Remember, you can't heat it in a microwave oven. Characteristics of kraft paper lunch box: 

1. Thickened PE film waterproof layer treatment to prevent leakage. 

2. Health and safety: high-quality food-grade base paper, which is not treated with fluorescent bleaching, and has no odor. 

3. The design is very retro, very nice. CHY hopes to help you.