Why is YKK zipper puller not used on hiking bags?

We’ll find most hiking bags that have a zipper that pulls with a plastic rope lock instead of a metal YKK zipper puller. The drawstring with cord lock is easier to use than a metal zipper pull, and it reduces the weight of the entire mountaineering bag. In cold weather, when you are climbing a mountain, pulling the metal zipper puller with your fingers can easily get stuck. The metal piece also makes a metal slamming sound when people are walking with the backpack.

Why is YKK zipper puller not used on hiking bags?-NIKKA | Dog Hooks, Swivel Snaps, Rings, Turn Locks, Belt Buckles, Bottom Studs, Logos, Cord Stoppers, Bag Feet, Ornaments, Handbag Frames, haberdashery, metal fittings for leather goods,leather goods metal,leather goods metal accessories