Why is the KFC sweet and spicy sauce box pitted?

Prevent the sauce from overflowing. KFC means KFC. It is one of the multinational chain restaurants in the United States and the second largest fast food and the largest fried chicken chain enterprise in the world. The outer packaging of the brand is very careful, and the box of sweet and spicy sauce is uneven to prevent customers from spilling sweet and spicy sauce when taking meals. This brand mainly sells fried chicken, hamburgers, French fries, mixed rice, egg tarts, soda and other high-calorie fast food.