Usually, food sacks can be transported effectively in large quantities to disaster-stricken zones. However, after the food is distributed, most food bags are thrown away as waste. The designers have identified an opportunity here to explore how food sacks can be re-used other than for holding items. DOUBLE-AID is a brand new food bag design. At the center of the bag, a red cross is attached so that people can clearly see that this belongs to relief work. The four corners of the bag are added with loops of red cloth. This allows two poles to be run through its sides to form a simple emergency stretcher. Based on the premise of not wasting earth’s environmental-protection energy, the main idea of DOUBLE-AID relief bag is to creatively add another function to the function of existing material to extend the functional feature of the product.