Positives:
- Insulating, vacuum flask and outside cold inside for several hours hot
Negatives:
- The Quickstop closure. After some time the closure is no longer locked, which meant that we had to always lock screw to use the vacuum flask. After a complaint at Isosteel we kindly get a new lock for free. However, the joy did not last long. Now the shutter snaps indeed, but the tea can not flow out as before, because the shutter is open only minimal bottom and the river dries up after a few ml.
Conclusion: Very good insulating properties, only the shutter needs to be worked.