This has really become my go-to morning tea for drinking a cup before work and putting some in a thermos for the drive. Today’s thermos serving was with a new (contigo!) thermos and tasted slightly metallic on some sips but overall I’m happy with the new thermos. Making 750 ml about a half an hour before I get up leaves the perfect amount of tea for a big mug and also a full thermos and approximately the right temperature to gulp down the mug if I’m late. It works well.