We drink most of our favorite drinks in porcelain/ceramic. Tea, coffee, hot chocolate. They all taste better out of a good old ceramic mug or cup, don’t they? Ceramic has been favored for years for being good at retaining a drink’s temperature for longer, while remaining inert enough to not alter its taste. Their non-porous nature also makes them ridiculously easy to clean too… so here’s my question. Why are most thermoses and flasks made out of metal instead?