There are usually four icons on the bottom of the lunch box, namely snowflakes, wavy lines, triangles and QS signs, which mean:
Among them, the plastic lunch box with the snowflake sign can be stored in a low temperature environment.
The wavy line means that the lunch box can be heated in a microwave.
The triangle means that the lunch box is recyclable.
And QS means that the quality of the lunch box meets national standards.
At the bottom of some plastic lunch boxes, there is also a wine glass logo, which means that the plastic lunch box can be washed in a dishwasher.
