Can You Put Hot Coffee in a Stainless Steel Bottle?
Yes — that's what an insulated steel flask is built for. Here's what to check.
Yes — putting hot coffee in a quality stainless steel bottle is exactly what an insulated flask is made for. Food-grade steel is non-reactive, so it won't affect the taste, and a double-wall vacuum design keeps the coffee hot for hours while keeping the outside cool enough to hold comfortably.
Two notes. First, only use a flask that's designed to seal for hot liquids — check that the lid is meant for hot drinks before flipping it into a bag. Second, coffee can leave odors over time, so wash it well (lid and gasket included) so yesterday's coffee doesn't linger in today's water. A bare steel interior makes that easy, since it won't hold the smell once cleaned. More in how vacuum flasks work.
Try the Steely vacuum flask.