Keep your kettle cost

It's been standard proceedure to fill a 2litre thermos flask first thing in the morning to see me through the day.It's the perfect way to stretch out 4 cups of tea over the day without having to keep boiling the kettle.
Unfortunately the other day I left it behind at my cousin's.
Enter the mother of invention, I've discovered our tea cosy just fits over our kettle!
Genius