Abstract: The present invention relates to portable flexible fillable barriers that are used to restrain the flow of fluids and to serve as reservoirs, containers (for solids as well) and embankments. The portable flexible fillable barrier is collapsible upon itself into a smaller size, facilitating storage and transportation, and is self-opening from the collapsed state. The portable flexible fillable barrier has a flexible fillable wall comprising an upper portion, a lower portion, a top end, a bottom end, several sides, a number of openings and a supporting frame that has inner structural cells with cell openings and an enclosing flexible membrane. Numerous portable flexible fillable barriers may share a fluid path formed by holes in shared side walls or formed by tubes leading from one portable flexible fillable barrier to another.