1. Raw Materials: The quality and thickness of the woven polypropylene fabric used in the manufacturing process can significantly affect load capacity. Fabrics with higher denier (thread thickness) provide increased strength.

2. Seams and Stitching: The strength and method of stitching (e.g., single, double, or reinforced seams) can affect load capacity.

3. Shape and Size: Size and design (e.g., U-panel, round, or baffled bags) can distribute the load differently and affect stability and capacity.

4. Lifting Loops: The location, number, and strength of the lifting loops determine the bag's ability to support a load under lifting pressure.

5. Environment of Use/Storage: Exposure to moisture, heat, and UV radiation can degrade polypropylene fibers and seams over time, reducing strength.