The multi-layer lunch box I use at work belongs to BOONI. It has been used for half a year, and the insulation effect is still online. Because each layer of Buni has a silicone sealing ring, it is very tight and has a very good sealing performance. In this way, not only the soup is not easy to overflow, but also the food will not smell after stratification. In addition, the six-layer insulation technology and the given insulation package, the food heat dissipation is slow, so the insulation is longer. Generally, the food wrapped in the morning is still warm at night. This is quite friendly for office workers, so it's very sweet without waiting in line for microwave heating ~