A secondary containment system used to transport and store a tank containing fluid. The secondary containment system having a containment body comprising an end wall, a back wall, two side walls, a bottom, and a top, wherein the walls are integral to the bottom, and wherein the top can be displaced from the containment body. The containment body is constructed of a three-layer configuration comprising an inner layer, an outer layer, and a central layer sandwiched therebetween. The inner layer defines a chamber in which the tank containing the fluid is stored. The chamber is sized and shaped so that the tank is positioned in the chamber and defines a void between walls of the inner layer and the tank.