I did detect this kind of flexible water tank inside of a facebook group recently. I really like this solution compared to other ways of water storage.
They are a perfect mobile solution, easy to install and remove. And no water noise out of the tank, compared to classic water tanks.
flexible Watertank or bladder for vanlife and overlanding - [Leaving Land Cruiser Club]
There I start to collect links to competitors too.
Which water tank solution do you use?
Guess depends a lot if you travel more short term at weekends, or if you travel extended...