I used a multi-layer insulated lunch box for my daughter, and the insulation effect was great! Because my daughter is in high school and has self-study in the morning, I usually put the rice in her lunch box around 6: 40, and her lunch break takes almost five hours. After opening, the food is still hot. When my daughter came back, she also reflected that the soup at the bottom was still very hot at noon, which scared me! Of course, this kind of multi-layer insulation lunch box not only has good insulation effect, but also has good sealing performance. After using it for so long, there is no water leakage and no odor. In short, it is not high to give a five-star praise!