Soldato
looks a great flask with a very useful capacity ,some people have said very long heat retention times are not useful in the real world but in my world i have very long days out that may turn into wild camping in the summer ,when we moved to cornwall we had to sleep in the car on house hunting trips in the winter and just pay for the odd campsite (was moving down without a job looking to buy for cash from the yorkshire house sale but only just affording the lowest priced properties} so again a flask was a great helpIn my quest for a thermal flask to give the best heat retention,
I have decided to buy one of these > https://www.outdoorwales.net/stanley-master-vacuum-bottle-14qt13l.ir
Why well because it uses quadvac.
From https://www.stanley-pmi.com/blogs/t...rand-introduces-master-series-for-spring-2017
QuadVac™ adds a double layer barrier to the double wall vacuum insulation, locking in heat or cold better than any other technology currently available. The four layers offer protection from convective, conductive and radiant energy transfer creating the highest thermal retention rates. To create the most durable bottle, Stanley Master Series uses 1.0mm thick stainless steel, compared to the industry standard 0.6mm, making Stanley’s construction 50 to 100 percent thicker than others on the market.
It is rather expensive but i have confidence this will be the best flask in my inventory, until i find out by testing it.
Dan.