The original Thermos stuff is surely worth every penny.
In our Concert Tour agency everybody has a different insulation bottle and they all work fine, I see and compare the bottles of a lot of artists.
But my original Thermos bottle is by far the best made I have ever seen.
That brand must be mentioned together with Hilleberg, Savotta, Karrimor SF, Essl, Ochsenkopf, Gränsfors, Fiskars, Victorinox, Fällkniven, Silky, Ortlieb, Carinthia, Kleen Canteen, Steinkogler, Trabert, Therm A Rest, Surefire, Gore Tex, Cordura and other high end equipment brands like that.