500ml rectangular take-out box contains 700 grams of rice. If the 500ml lunch box only contains rice, it will take about one kilogram to fill. In addition, it also depends on the type of rice, but the impact will not be too big. If it is 1000ml, it will need more than two kilograms, and the general take-out lunch box is 700ml. Therefore, when purchasing lunch boxes, try to buy recyclable and biodegradable lunch boxes. If these plastic lunch boxes are directly incinerated, it will cause serious secondary pollution to the environment.