A geo tank is a large, flexible liquid storage system. It does not have very hard walls. It doesn’t need a construction crew to build it or bolt it down to the ground.
At its core, it is a sealed chamber made of engineered synthetic fabric, tough enough to hold millions of litres of liquid but flexible enough to fold up and be transported on a flatbed. When empty, it lies flat. When full, it takes a low rounded shape distributing the entire liquid weight evenly across the ground below it.
Read more :- https://www.wetcomb.com/blog/geo-tanks-explained-design-function-and-real-world-applications/