The main body of a colored woven bag is made of warp and weft plastic flat yarns woven together, formed through heat sealing or sewing. Its load-bearing capacity depends primarily on three parameters: the tensile strength of the flat yarns (typically 50-80 N/yarn), the weaving density (number of warp and weft threads per 10 cm), and the bottom seam technique.

For example, woven bags with a load-bearing capacity of 15-50 kg typically use a double-chain stitch at the bottom to ensure even stress distribution. Some products also feature a slit with thicker thread at the bag opening for easier gripping during handling.