I am a tea drinker, and the huge majority of thermal bottles or containers have stainless steel insides. For some reason stainless steel alters the taste of tea–makes it more metallic.
I make tea the old-fashioned way in a teapot, and make two cups at a time. One goes into my mug, and the other is stored in a thermos. I've been using an 18- or 20-ounce thermos (one each) for this purpose, and the tea doesn't stay at serving temperature more than an hour or so, perhaps because I have only 9 ounces stored inside. And maybe my old thermoses no longer retain heat like they should.
In any event I searched quite a while for another glass-lined thermos, and settled on this one by eWater. It's made in China, and holds only 11 ounces, and that's filled to the brim. The lid still fits, though, without displacing any of the liquid because it sits on top of the bottle rather than extending into its insides.
After an hour of storing tea, the lid is warm. The sides of the container are cool, so the thermal weakness of the unit is the lid. But it still holds my additional cup of tea at good serving temperature for up to two hours, which is what I was looking for.
I've read other reviews saying the bottle leaks. While screwing on the lid, it comes to a sudden stop, and a little additional pressure prevents leaks. It's not that much of an issue for me because it will store tea either on my kitchen counter or in my vehicle's cup holder, and will remain vertical. I'm not sure I would trust it, for example, in a briefcase.
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