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Grain and grain product spoilage is an important global food security issue. I recently spoke to the director of an international freight company who had lost over 4 000 tonnes of rice due to the poor quality of woven polypropylene sacks that had been used for packing. The weave had loosened and separated due to defects in the polypropylene strands. This, combined with heavy manual handling in tropical conditions, had resulted in product spillage, moisture ingress and insect infestation.