Review on Efficient Classic Thermos FDH, 1.65L: Durable Stainless Steel Design by Barbara Krasowicz ᠌

This low-volume cooling effect is due to physics. If you do not drink 2 liters at once, then the remaining amount cools down very quickly in any 2 liter thermos. This is rarely described, but it is worth considering when buying. The quality of the thermos itself is more or less normal. Some pros: A good thing, but, as it turned out, it is suitable only for certain purposes. Keeps the temperature for a long time only when it is completely filled. With its cons. Practically does not keep the temperature with the remaining small volume of water. For example, if, in a preheated thermos, pour only a mug of boiling water, then this volume will cool down in 30 minutes.