When we buy an insulated lunch box, we often ask this question. What is the insulation effect of your insulated lunch box? How many hours can this insulated box keep warm? How long can the insulated lunch box keep warm? Material and quality are related.
At present, there are more stainless steel insulated lunch boxes on the market. The general heat preservation box can keep heat for two or three hours, but there are many good heat preservation boxes on the market. This kind of better heat preservation box can keep heat for up to about six hours. Of course, this is mainly related to external weather conditions. Even if it is a good insulated lunch box, if its previous heat preservation time was six hours, it can only keep it warm for about four or five hours in cold weather.
