not illegal.

according to the inquiry data. It is not illegal for catering businesses to charge packaging fees, lunch box fees and packaging fees. But we must pay attention to the fair price. The packaging fee charged shall not significantly exceed the cost of the lunch box itself. And give consumers the right to choose. Some lunch boxes with better material and higher cost. The packing fee can fluctuate within a reasonable range.

packing boxes are the products of restaurants. Restaurants can choose to give it away for free or sell it.