Storage device, for the packaging of loose materials, comprising: - a flexible container, defined at least by a back wall and lateral walls (21, 22, 23, 24), forming a volume for storing material, - flexible suspension loops (3, 4) in the upper portion of the container, intended for lifting, said storage device being flexible being able to go from a storage position, substantially folded flat, to a substantially three-dimensional use position, said suspension loops (3, 4) have a stiffness such that the suspension loops are self-supporting, in said three-dimensional use position of the container, while protruding above the flexible container, the suspension loops (3, 4) each comprising a strap, flexible, fastened at its two ends to the container, and having an intermediate free section of length protruding above the container, as well as an elastic element, longilineal, made of a semi-rigid material, extending lengthwise along the strap and having a stiffness such that said elastic element cooperates with said strap in order to ensure the retention of the suspension loop (3, 4) in a self-supporting position, and wherein said suspension loops (3, 4) have sizes sufficient to be brought together at a point passing through the axis of gravity of the storage device, the device comprises a connection means, flexible, connecting, said suspension loops (3, 4) by grouping them together at their upper portion, in the same attachment zone (Za), characterised in that: said flexible connection means, is intended to removably connect, said suspension loops (3, 4), said connection means being able to go from a closing position (Pf) connecting said suspension loops together to an opening position (Po) for which the suspension loops are untied, and wherein the material of the strap forms a fold, receiving, as an insert, said elastic element, said elastic element being a tubular element extending lengthwise, not only along the free section of length of said strap, which is intermediate, but also along the two ends of the strap fastened to the lateral walls (21, 22, 23, 24) of the container, and only over an upper length portion of the container, and wherein the stiffness of the suspension loops is such that the retention of the suspension loops is only ensured once said suspension loops are connected at their upper portion by said connection means. - a flexible container, defined at least by a back wall and lateral walls (21, 22, 23, 24), forming a volume for storing material, - flexible suspension loops (3, 4) in the upper portion of the container, intended for lifting, said flexible connection means, is intended to removably connect, said suspension loops (3, 4), said connection means being able to go from a closing position (Pf) connecting said suspension loops together to an opening position (Po) for which the suspension loops are untied, and wherein the material of the strap forms a fold, receiving, as an insert, said elastic element, said elastic element being a tubular element extending lengthwise, not only along the free section of length of said strap, which is intermediate, but also along the two ends of the strap fastened to the lateral walls (21, 22, 23, 24) of the container, and only over an upper length portion of the container, and wherein the stiffness of the suspension loops is such that the retention of the suspension loops is only ensured once said suspension loops are connected at their upper portion by said connection means.