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Frequently Asked Questions
That varies by model and by how full you fill it, so the individual product page carries the number. Two things are true of any flask: a full one outlasts a half-empty one, because the air in the gap is what drains the heat away, and warming the flask through before you fill it adds time on top.
Nothing. They're two names for the same thing: a double-walled stainless steel container with a vacuum between the walls. "Flask" is the usual British term, "vacuum bottle" the more technical one.
Stainless steel doesn't absorb flavour the way plastic does, so a properly washed flask won't carry yesterday's coffee into today's. Rinse it out after each use rather than leaving it sealed with dregs in the bottom.
Yes. Vacuum insulation slows heat moving in either direction, so the same flask keeps iced drinks cold.
They are. Separate the stopper into its parts first, otherwise the threads never really get clean.