A lunch box is a box specially used to hold meals, also called a lunch box. Most of them are made of aluminum, stainless steel, and plastic.

(1) Seven key points when choosing a lunch box:

1. Look at the texture. Lunch boxes are made of plastic, glass, stainless steel and other materials.

2. Depending on the function, there are functions such as heat preservation and microwave heating.

3. Look at the structure, there are single layers and double layers.

4. Looking at the shape, there are round, oval, square and rectangular shapes.

5. Depending on the capacity, you can choose between 500ML and 2000ML.

6. Look at the brand and buy a quality-assured brand lunch box.

(2) Points to note when distinguishing good from bad:

1. When purchasing, check whether the surface of the lunch box is marked with a triangle and contains "5"

2. Choose a lunch box capacity that suits your appetite. For most people, 1 liter is enough.

3. Judge the sealing performance from the way the lid is closed and whether there is a silicone ring.