Primus TrailBreak Lunch Jug Large

Good to keep food warm for a few hours, do not expect insulation to equal a good water thermos. Recommended if you prep a hot meal in the morning to take for lunch.

I bought it recently for a solo winter trip in the mountains I am planning, the idea being that I will cook in a large pot in the evenings, eat dinner, and save half for next day's lunch. This way I have a hot meal ready to stave off hypothermia if the temps drop abruptly in the night, and I save some fuel by cooking larger quantities.

The jug is well made, robust, the powder coating is nice. It securely closes; I expect no leaks as a silicon like joint presses on an inclined shape inside the opening. Vertical threads on the lid allow to open and tighten the lid when closing.

Decided to test it with boiling water, filled it as high as I could (thermoses lose their performance as a function of empty space inside), and soon after the lid became warm to the touch. The lower part was cool, no loss of warmth, but the lid was obviously a source of losses.

The jug's rim goes pretty high inside the lid, and may not be surrounded by insulation, resulting in a major thermal bridge. Water thermos have an inside lid, often containing insulation, and an additional lid with some insulating power, doubling as a drinking cup. This seems to be the way to go.

I still think it will provide a good degree of insulation to my meals. I will fill it with boiling water and leave it in as I cook, so as to warm the double wall, and then add my meal before I seal it for the night.

Background

Just bought it and tested it at home. It is my first food thermos, but I have used water thermoses for years and can compare the two.