How to choose a disposable lunch box with good quality?

Nowadays, disposable lunch boxes are generally used for packaging, so you have to pay more or less attention to the food that is eaten directly into the stomach. Therefore, I would like to give you some suggestions on the purchase of disposable lunch boxes. I hope to be helpful.
1. You can smell the lunch box. If you smell a pungent smell, don't buy it.
2. Inferior disposable lunch boxes can be easily torn and are not hard enough.
3. If the disposable lunch box will be burned when filled with freshly cooked food, then do not buy it.
4. Look at the price. If the price is too cheap, be careful not to harm your body just for the sake of petty gains.
5. Check to see if there are any relevant certificates of qualification and the like. Do not buy lunch boxes that are without safety guarantees.
6. If the disposable lunch box feels rough, not smooth at all, and the thickness of the entire lunch box is uneven, don't buy it.