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@TheBrick(Tommy)
It seems to me that this is a product that is trying to cover a very small and to a point none existing niche. After 8 hours in the winter the drink from my flask is always still warm enough to be considered a hot drink. Not many people need a thermos to keep a drink warm for longer than that. If I was going out for longer than that I'd take a small stove, which would be lighter than a thermos flask with chemical had warmers and do a better job at heating my drink and allow me to cook a small hot meal which would be well wanted if I am out all day in the cold.
I know your not actually going into production with this because it's a uni project but it's a point to consider is the size of your niche which you are working with, good luck with you project though.