Review on 🍶 THERMOS Stainless King 40 oz Vacuum-Insulated Beverage Bottle in Matte Steel by David Thomley

I bought this mug because none of my other coffee mugs could keep water hot or even warm for 10 hours. My use case is to make baby food warm to the touch. My baby is 6 months old, stays up all night and very picky about milk temperature. She won't drink more than a few ounces unless it's warm milk. . very annoying. Anyway, I decided to try other travel coffee mugs first and for the first few hours the boiling water stayed pretty hot. However, by 6am it's warm and by 10am when the baby gets up and wants milk, it gets a little warm/cold. This thermos is terrible. I put it in boiling water at 7pm, at 3am I still feel boiling water. The water still feels hot at 7am, 12 hours later. A little hot at 7pm, 24 hours later. 36 hours later, cold water still needs to be mixed in until 7am. Maybe the isolation area of this particular space is like a vacuum, but I never thought such isolation was possible. Still a great thermos.