How do you keep Hot Food Hot in your kid's lunches??

My son loves soup, my daughter loves noodles and mac and cheese. and I have tried the "hot" thermoses and containers.. but by the time they have lunch.. the soup is barely warm and the noodles are gross.. it's not only a waste of food, but my kids don't eat well at lunch when they need to refuel...

Kids can't have hot water there at school, like I had, I was able to fill up my noodles, etc...

I feel like Iv'e tried everything.. except one of those Hot packs.. like a lunch box that stays warm? Insulated? Do they work? Do they even exist?

Any suggestions? I love my kids having warm soup at lunch during the cold here...​

About Jessica
Born: Novato, California
Current: Sherman Oaks, California
Birth: May 28
On since: Aug 5, 2013
We live in Los Angeles, CA. I'm a writer, comedian, actor and single mom of two. Parenting is hard. I try to keep a sense of humor about it all and find the find the funny... in what is most likely NOT funny (i.e. boogers, meltdowns, homework, etc.).