Worlds Most Innovative Vacum Flask. Top Quality and Nordic design.
The falsk on the left is full - the right one is emty..
So simple and ingenious that a world patent was obtained for the invention.
How it works
A full 1 liter thermos weighs 1 kg. more than an empty bottle. Spirit actually has a scale integrated into the bottle and as the bottle is emptied it weighs less and a larger part of the red indicator band appears.
Thousands of jugs have been sold for 15 years. No complaints received. The first batches of thermos that were sold are still in use in hotels and restaurants