Method for the production of bags for the transport and storage of bulk goods or liquids, wherein use is made of a tubular fabric cut into several pieces of fabric, which pieces of fabric are then assembled together, comprising the steps of: - providing a tubular fabric; - flattening said tubular fabric to form a double-thickness fabric having two opposite sides, respectively a first side and a second side, extending between first and second flattened edges (12, 14); - folding-in or pleating the first flattened edge of said double-thickness fabric to form a first gusset, said first gusset being defined by a first oblique section extending between the first folded-in flattened edge and a first gusset end positioned on the second side of the double-thickness fabric and by a second oblique section extending between the first folded-in flattened edge and a second gusset end positioned on the first side of the double-thickness fabric; - folding-in or pleating the second flattened edge in a manner symmetric to said first folded-in flattened edge, - cutting said tubular fabric into pieces of fabric and assembling said pieces of fabric to form a bag, wherein the tubular fabric is cut at least into first and second pieces of fabric (10, 10') each comprising the first and second sides (11a, 11a', 11b, 11b'), the first and second folded-in flattened edges (12, 12', 14, 14'), the first gusset (20, 20'), the first and second oblique sections (13, 13', 17, 17') and the first and second gusset ends (15, 15', 19, 19'), characterized in that assembly of the first and second pieces of fabric (10, 10') comprises the steps of: - disposing the first and the second pieces of fabric (10, 10') such that the second side of the second piece of fabric is in contact with or close to the first side of the first piece of fabric and such that the first and second gusset ends (15, 19, 15', 19') of the first and second pieces of fabric (10, 10') are substantially aligned; - assembling the first and second pieces of fabric (10, 10') by means of seams formed around or near the first and second gusset ends (15, 19, 15', 19') of the first and second pieces of fabric (10, 10'). - providing a tubular fabric; - flattening said tubular fabric to form a double-thickness fabric having two opposite sides, respectively a first side and a second side, extending between first and second flattened edges (12, 14); - folding-in or pleating the first flattened edge of said double-thickness fabric to form a first gusset, said first gusset being defined by a first oblique section extending between the first folded-in flattened edge and a first gusset end positioned on the second side of the double-thickness fabric and by a second oblique section extending between the first folded-in flattened edge and a second gusset end positioned on the first side of the double-thickness fabric; - folding-in or pleating the second flattened edge in a manner symmetric to said first folded-in flattened edge, - cutting said tubular fabric into pieces of fabric and assembling said pieces of fabric to form a bag, wherein the tubular fabric is cut at least into first and second pieces of fabric (10, 10') each comprising the first and second sides (11a, 11a', 11b, 11b'), the first and second folded-in flattened edges (12, 12', 14, 14'), the first gusset (20, 20'), the first and second oblique sections (13, 13', 17, 17') and the first and second gusset ends (15, 15', 19, 19'), - disposing the first and the second pieces of fabric (10, 10') such that the second side of the second piece of fabric is in contact with or close to the first side of the first piece of fabric and such that the first and second gusset ends (15, 19, 15', 19') of the first and second pieces of fabric (10, 10') are substantially aligned; - assembling the first and second pieces of fabric (10, 10') by means of seams formed around or near the first and second gusset ends (15, 19, 15', 19') of the first and second pieces of fabric (10, 10').