Bag for transporting and handling liquid or quasi liquid substances

A bag for transporting and handling liquid or quasi liquid substances that comprises at least a bottom and four sides, the bag being provided with a sealed inner envelope including filling members and being also provided with reinforcement plates integrated in the sides and being also provided with members for lifting same, wherein the four sides of the bag are connected along adjacent edges to form vertical and oblique ridges at each of four corners of the bag and wherein the bag includes at upper portions thereof an overhanging collar oriented towards an inside, four parts of the collar being connected at their adjacent edges along the oblique ridges oriented as in a pyramid, wherein the lifting members include on the one hand lifting straps including a section sewn on the above-mentioned ridges of the collar and a section free of attachment to the bag, so that each lifting strap also sewn on the vertical ridge of the four corners of the bag has a section oriented back into the bag along said vertical and oblique ridges so as to further extend along interior vertical and oblique ridges, and on the other hand a cloth piece connected at least to the lifting straps grouped by pairs along said free section and said sewn section, said piece of cloth forming with both lifting straps of the same pair a tube or a duct in which the fork of a forklift truck can be engaged, the sewn section and the free section of each lifting strap having different lengths and being in an oblique plane with respect to a horizontal insertion axis of the arms of the fork of the forklift truck in the tubes or ducts, wherein the sewn section and the free section of each lifting strap form a loop that is positioned alongside the collar and wherein two extremities of the free section of each lifting strap are connected to the sewn section thereof at two separate points located on one oblique ridge of the collar.