How do you keep stuff warm in your kids lunch box?

Moms! How are y’all keeping stuff warm in kids lunch boxes? He wants to take leftovers for lunch, but i don’t want them to be cold! I have a bentgo box for him! I’ll take any suggestions, we get them back Sunday & i want to be prepared!

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They have little thermos. My kids love them.

There are thermos lunch bento boxes! Buy one. They are amazing.

Large mouth thermos(got ours at Walmart in sporting goods section) and activate it with boiling water for several minutes before putting hot food into it.

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I got this for my daughter. I fill the thermos with the leftover hot water in my tea kettle after I make my morning coffee. Let it sit until I’ve finished the coffee then dump and pour in the microwaved leftovers she wants for lunch. She says it’s steamy hot at lunch time. Comes with a little foldable spoon that fits in the lid too.