This stainless steel lunch box usually can keep food warm or cold for about 2 hours with the your extra insulated lunch bag. It's not only for lunch box container but also can be used as cooler bag suit for necessity to gym, picnic and other outdoor actives where you want to eat your own delicious food. It is perfect for student, office worker, outdoor work etc. It is very convenient to carry your meals, fruits, and snacks. It is suitable for school, office or outdoors use.