1, stainless steel lunch box. The lunch box made of stainless steel has stable chemical properties, relatively good heat preservation and sealing, convenient cleaning, corrosion resistance and low temperature resistance, and can be processed in layers when serving. But microwave can't penetrate, and stainless steel lunch boxes can't be heated in the microwave oven.

2. Ceramic lunch box. Ceramic lunch boxes heat faster, which can shorten the heating time of meals and keep them fresh. However, when choosing a ceramic lunch box, don't choose a ceramic lunch box containing gold and silver wires to avoid sparks when heating.

3. Military lunch box. Military lunch box is a professional lunch box used by troops in marching and fighting. It is light and compact, easy to carry and not easy to rust. Moreover, the military lunch box is mainly made of aluminum, which is thin and fast in heat conduction, but attention should be paid to avoiding burns when using it.