Abstract: A foldable water container comprising a tetragonal body having a quadrilateral supporting frame pivotably secured to one of the four ton edges thereof, a retaining channel made around the other three top edges, and a plurality of fold lines. The quadrilateral supporting frame is engaged in the channel to stretch open the body of the water container when the water container is in use. The quadrilateral supporting frame is disengaged from the channel permitting the body of the water container be folded up through the fold lines into a flat structure when the water container is not in use.