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First of all, when choosing a thermos, you need to decide on its type . It can be with a button or with a lid. The push-button one is more convenient to use, but it can quickly become clogged and start leaking. It is also not the best option from a hygiene point of view, because you may not always have clean hands when pressing the button.
Thermoses with lids cannot be broken, but to open them you will have to use two hands at once. And this may not always be convenient. But in any case, the choice is yours.
It is believed that the larger the thermos itself, the longer it will maintain a high temperature . And the thermos is really high-quality if after 6 hours the boiling water in it has cooled to 78 degrees, and after another 24 hours – to 50 degrees (but this is only if the thermos has not been opened).
The next point is the material . A thermos can be made of glass or metal. In a glass thermos, the liquid usually stays hot longer, but the heat can escape through the stopper. In metal thermoses, a screw stopper is often used to reduce heat loss.
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It should also be noted that a metal thermos itself will be stronger. A glass one is easier to break and damage.
As for the volume of the thermos, a liter version will do for a couple of people. But if you want to buy a thermos for short walks, then a volume of 0.5 liters will be enough. For coffee lovers, a 0.35 liter thermos will be useful, and for those who want to keep food hot – an option with a wide neck.Source: iXBT.com