The Primus Vacuum Flask is a double walled vacuum insulated flask with a powder coated stainless steel finish. The stainless steel inner is BPA free and easy to clean. The lid doubles as a cup and is double walled with a plastic liner so will keep your brew warm as you drink it.
The Vacuum flask comes with a Clickclose closure which seals with a pop up button. This is quick and easy to operate one handed, even with gloves and ensures no leaks. To get the best performance from you flask Primus recommend that you pre-heat your flask for 5 mins with water at 95°C.
The Primus Vacuum Flask is also avliable in 1000ml, 500ml and 350ml.
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I used the vacuum flask twice up until now, and as a general impression I am amazed at how well it maintains the temperature of hot drinks while mountaineering. More specifically, both times I used the flask, I poured hot (almost boiling) tea into the flask, without even pre-heating it, and the tea was still steaming hot after 6-8 hours of mountaineering, temperature 0 to -10 degrees Celcium, sunny weather but with the flask being carried in the outer pocket of my backpack, and after heaving opened it 8-10 times.
One of the two interchangeable lids is not convenient for mountaineering (you actually need 3 hands or both of your hands and a table to be able to unlid and drink), but the other one is very convenient to use in mountains, even with thick gloves. One minor disadvantage: I bought the 750ml flask, and since it is a bit wide (compared to classic 500ml flasks), I had some difficulty to put it in the outer side-pocket of my backpack using one hand without taking the backpack off. But in general, I am very satisfied with my purchase!
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