Which zipper material is best for luggage and bags?

Q: Which zipper material is best for luggage and bags?

For most soft luggage and bags, a #8 or #10 molded resin or heavy coil chain is the practical choice. Both resist repeated flexing at corners, tolerate abrasion from packing and accept a two-way slider for wide openings. Resin adds stiffness and holds a clean edge; coil is lighter and follows a curved gusset more smoothly.

Metal is used where the zipper is a visible premium feature, particularly on leather goods and day bags. Specify brass rather than a thin decorative plating, and confirm salt-spray performance if the bag will be used near the coast. A metal chain on a soft bag can dent or abrade adjacent leather, so a tape guard or a slightly recessed seam helps.

Details decide longevity: a slider with a locking mechanism, a puller that will not snag in transit, reinforced tape at the ends of the opening, and a chain long enough to let the bag open flat. For checked luggage, test the loaded bag through a drop cycle; the zipper seam usually fails first at the corners, where the tape is stretched around a radius.