I have gained this flask after some research here on Amazon in the reviews. Zwsr I wanted to have a volume of one liter, but the turquoise color of the smaller bottle would have been much better for me. ... The thermos holds itself outside pleasantly smooth on as a noble coat. But even though the bottle is made of metal, instead of plastic, it feels nevertheless not very cold at. => * Thumbs up * The insulating / heat-retaining effect is amazingly good. I had filled my selbstgebrühten coffee and was still after 6-8 hours really nice hot. Also the flavor was unaffected by the material. Just as is the weak point in normal bottles with plastic closure yes times like. Despite milk and sugar, the coffee had a pure taste. The bottle can be also easily fasten and unfasten and it closes while also very reliable. The casting is also possible without spills. The first thorough cleaning is still pending, but I already know that my bottle brush will fit well through the spout. I'm ready very satisfied with my purchase, and I hope the quality keeps well after prolonged use at.