Seams
When a seam of a bag breaks, it causes the threads which keep the fabric together to unravel. The content of the bag will eventually fall out as the fabric breaks apart. However, if the thread on one side of the bag securely hooks the thread on the reverse side, the bag will unravel at a slower rate. As a result, there’ll be time to sew over and strengthen the bag. Oftentimes, sewing over strengthens the bag even more than before and prevents the content from spilling.
Hopefully, things aren’t too late and there still is time and room to patch up.