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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.
Yes. Flask is the everyday British word for a vacuum insulated bottle and it is what most people here will call one. You will also hear vacuum flask, and flask bottle, and all three name the same object. Vacuum bottle is simply the more precise description of how it works, and everything in this collection is all of these things.
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.
Thermos is a brand. A vacuum bottle is a type of product, and it is what this collection contains.
The confusion is understandable. Thermos was an early and very successful maker of vacuum-insulated containers, and in casual speech many people reach for the brand name when they mean the product. But the two are not interchangeable: one names a company, the other names a technology.
The technology is vacuum insulation. Two walls of stainless steel with the air removed from the gap between them, leaving almost nothing to carry heat in either direction. That is what keeps a drink hot for hours instead of minutes, and it is what William Stanley Jr built when he made the first all-steel vacuum bottle in 1913.
So if you came here looking for a Thermos bottle, what you want is a vacuum bottle, and this is the right page.
Because Thermos is another company's brand, and putting it on our own products would be misleading about who made them.
Vacuum bottle is also the more accurate description. It names what the product does rather than who first sold one. You will also see vacuum flask, and in British usage most people simply say flask, which is the word used across this collection.