Frequently Asked Questions

How long does a Stanley flask keep drinks hot?

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.

Stanley 1913 Flasks

Stanley has been making vacuum flasks since 1913, which is long enough that in Britain the word and the brand are close to interchangeable. The principle hasn't changed either: two walls of stainless steel with the air drawn out from between them, so heat has nowhere to go.

What that means in practice is a flask you fill at six in the morning and drink from at lunch, still hot.

Coffee Flask

Coffee is what most flasks get bought for, and it's the hardest test, because coffee goes stale-tasting long before it goes cold. A stainless steel interior doesn't hold flavour between fills, so tomorrow's coffee tastes like coffee rather than like last week's. Wide-mouth pouring means you can fill it from a cafetière without a funnel and clean it properly afterwards.

Tea Flask

Tea is more demanding than coffee about temperature, because it wants to go in near boiling and stay there. A vacuum flask handles that, and the same flask does iced tea in summer without any change of kit.

Flask for Hot Drinks, Whatever the Drink

Soup, hot chocolate, mulled anything on a cold touchline. If it's liquid and you want it hot in four hours' time, a vacuum insulated flask is the tool.

Built to Be Inherited

Flasks get handed down. That isn't marketing, it's the ordinary life of a well-made one: a hammertone green flask that went to work with someone's grandfather is a genuinely common object in Britain, and it's the clearest illustration of what Built For Life™ was meant to describe.

Stainless steel throughout, stoppers and cups that can be replaced rather than retiring the flask, and a silhouette we have not needed to redraw. Made with recycled steel, free of BPA, and fine in a dishwasher.

Complete Your Collection

Need the same heat retention in something cupholder-sized? That's Travel Mugs. Want to drink straight from it rather than pour? Mugs & Cups. Café gathers the hot-drinks range in one place, and Drinkware holds the lot.

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