Isosteel VA 9562DQAT Duo Vacuum Flask Titanium Gray 1.0L of 18/8 stainless steel with Quick Stop Einhandaus ... and 2 removable drinking mugs (household goods)
This flask is perfect. At the very first use came before the endurance test: an entire filling with coffee holding a day at Europa-Park (in December) warm. In the afternoon you could see the first time that the temperature softens a bit, which in the circumstances is absolutely but ok. Approximately 15 hours after filling the coffee was still little more than lukewarm.
