Abstract: A flexible floating tank for conveying liquids comprising at least two elongated flexible elements of revolution joined side by side by a flexible linking harness and provided with inflating gas for maintaining their geometric shape by internal pressurization during various stages of use. The elements are provided with oblique conical end portions and are internally divided by bulkheads. Each element may have a sump which forms a stabilizing keel and also facilitates emptying through a dip pipe while internal pressurization is maintained through a separate duct.