1. Make sure the zipper is closed and wiped clean from dust and dirt.
2. Apply a conservative amount of lube from the tube along the top of the zipper from end to end.
3. Pat dry any excess lube. (Using too much lube can cause the fabric to stain so use it carefully.)
4. Use lubricant whenever the zipper is feeling stiff or before storing the bag. Always make sure the bag is closed completely before long-term storage.