Abstract: A flexible bulk container for carrying up to one ton of material in e.g. granular form. The container includes a bag of woven fabric such as polypropylene. Where necessary for reasons of reinforcement, i.e. where lifting loops are attached, or adjacent seams, the warp of the fabric is of increased strength per unit width. This is achieved by the use of higher tenacity warp threads, and/or a higher density of warp threads.