If you heat it before adding food, it will stay hot. I pour boiling water (not just boiling water), cover with a lid and let it brew for 5-10 minutes. That's not how I fill a cold thermos with hot food. Drain the water, add food and you're done. When my son and I first sent soup to school, he came home and told me the soup was too hot to eat. :-) If you're planning something like soup, take a spoon with you. The spork on top is not suitable for soup.
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