Thermal Jar/Flask to Keep Food Hot

One of the more stupid ideas I had come across is cooking your food, stuffing it in a thermal container then eating it hours later (eg cook in the morning, eat at lunch)

Or so I thought, I tried it with a flask and it was sensational. Probably better than eating it straight from the pan. Hot and tasty. I highly recommend it, especially if you’re like me and you hate anything that comes out of a microwave.

So I invested in one of the bad boys below. My problem is how do I carry this thing as it’s too awkward for my work bag. I want to attach a carabiner to this… any ideas?

https://www.thermos.com/eat/genuine-thermos-brand-stainless-king-vacuum-insulated-stainless-steel-food-jar-24oz.html