The invention relates to a Flexible Intermediate Bulk Container (FIBC) having a body made of flexible woven fabric, and integral handling devices, wherein the fabric is woven from opaque oriented polyethylene terephthalate (PET) strips having a density of from 500 to 1300 kg/m3 and a tensile strength of at least 250 MPa. Advantages of said FIBC include directly printability with the usual type of inks, giving excellent contrast and good adhesion, without pre-treatment like a corona- or flame-treatment. The FIBC based on the PET fabric also shows higher gloss; better UV resistance; better mechanical properties, like high tensile strength and creep resistance; favourable abrasion resistance; and higher temperature resistance than a conventional big bag based on polypropylene strips. The invention further relates to such a FIBC based on stress-whitened PET tapes obtained by a special drawing process.