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.
I completely understand your points and we have picked the product/concept to far more bits than has been by you guys but coming up with something novel seems to be a bit tricky, it is a bit like solving a problem that isn't really there. (please ignore this post if you are taking the survey)
I completely understand your points and we have picked the product/concept to far more bits than has been by you guys but coming up with something novel seems to be a bit tricky, it is a bit like solving a problem that isn't really there. (please ignore this post if you are taking the survey)