Things You'll Need
Instructions
Rub a #2 pencil along the zipper if it is worn out. The graphite from the pencil lead will smooth over any rough spots that keep the zipper from gripping properly.
Lubricate the zipper with a lightweight, non-greasy lubricant for a zipper that doesn't slide very well. One common lubricant is softened candle wax.
Replace the slider on the zipper by removing the seams that hold the bottom edge of the zipper to the bag. Remove any metal stops at the base of the zipper using pliers. Use a seam ripper carefully to break each stitch individually, and then pull the loose threads out. Remove the old zipper foot by unzipping until it falls off. Install a new one by zipping it on. Stitch the zipper edges back into the sleeping bag, tying the thread at each end to secure.
Replace a damaged zipper by first using a seam ripper to remove the existing zipper. Be cautious not to damage the bag itself. Alternatively, cut the old zipper off along the webbing, close to the seam, being careful not to cut the bag. Pin the new zipper in place and sew using a needle and thread or sewing machine. It is recommended to use the same stitch holes from the old zipper if possible.