Common everyday word for a zipper, used for clothing, bags, etc. Possibly derived from 巾着 (きんちゃく), a drawstring pouch.
See also: ファスナー
The zipper on this jacket is broken.
Please close the zipper on the bag.
I opened the backpack's zipper and took out my textbook.
It was cold, so I zipped my coat up all the way.
The bag's zipper got stuck and won't move.