Comment by BobbyTables2
1 day ago
It’s funny how quickly the general public forgot about the “vacuum thermos”. (Perhaps more popular before StarBucks overran society).
Those flasks don’t have any space age insulating material - mainly just a vacuum…
Technology from 1892…
They are more popular than ever, actually. Pretty much all those fancy cups and bottles (like Stanley, other brands available) sold to keep your coffee hot/drink cold on the go are vaccum ones. It's just updated and more robust design compared to the older thermos flasks.