During the hot summer months, it is important to know where to place ice packs when storing food such as lunch boxes and gimbap. Quite a few people put ice packs (refrigerant) under their lunch boxes. However, it has been pointed out that this may reduce the cooling effect and cause food to spoil more quickly. If you place a refrigerant on top of the lunch box, the cold air will spread downward, cooling the entire food more effectively. This storage method has recently...