YKK | セミオートマチックロック | クローズドエンドジッパー | メタル | #5 | 5 3/4インチ - 14.5cm

The auto-lock slider is exactly what I needed for a backpack pocket — it stays put until you tug the tab. The metal teeth feel sturdy and the closed end makes installation straightforward.

Replaced the zipper on my work bag and the closed-end design is exactly what I needed. The pull glides up and locks in place when you let go, so the bag stays shut even when it's stuffed full.

The auto-lock slider clicks firmly into place with no play at all, and the metal teeth feel solid when zipping up a heavy canvas bag. It’s a bit stiff for the first few pulls, but that loosened up after a couple of uses.