When evaluating used jute bags (commonly known as gunny bags), the primary focus should be on structural integrity and cleanliness. Ensure the bags are Grade A quality, meaning they are free from large holes, significant patches, or heavy oil stains. Check the weaving density (Hessian vs. Sacking); for heavy-duty use like sandbags or agricultural storage, a tighter weave with reinforced side seams is essential. Additionally, verify that the bags have been properly dried to prevent mold or mildew, which is a common issue in recycled natural fibers.