1, soak the insulated lunch box in hot water for a while, or pour boiling water on the lid for a while, and the lid can be opened.

2. The reason why the microwave lunch box can't be opened after heating is that after heating, the air in the microwave lunch box is heated and expanded, and some air overflows, causing the lid of the lunch box to be sucked. You can reheat the microwave lunch box, and after reheating, take out the microwave lunch box immediately and open the lid immediately, which will easily open the lid.