My wife and I wanted to set up new Thermoses and she opted for this model, but I due to the design for the Primus thermos 0.7L. After a test, however, the situation is so that I have the Primus thermos back end. After yesterday, the feeling had the Primus Thermos Bottle keeps the temperature hardly the drinks we made the following test: Last night we filled both bottles with boiling water and made this morning after 12 hours of the test: the Primus Thermos Bottle contained this morning cold water. No talk of warm or hot. However, the water of Isosteel was still hot and steaming.
The bottles were for this test both in a 20 ° -living room.
Conclusion: + Keeps the heat extremely well + Good workmanship - Has no pressure outlet, only the screw cap, which, however, has similar function - Is a little higher
Thus, I will return the Primus bottle and also ordered me a Isosteel bottle.