If you have found that a zipper slider is not moving up and down or will not close any of the zipper teeth, it may be because the zipper has become
How to mend a zipper on a bag
how to fix my backpack zipper? : r/Anticonsumption
How To Replace a Broken Backpack Zipper
How To Fix A Backpack Zipper
How To Fix A Backpack Zipper
5 Ways to Fix a Broken Zipper - wikiHow
How to Re-Align the Zipper on a Backpack - iFixit Repair Guide
HOW TO CHOOSE SIZE: (See Video) Start by checking the back of your broken zipper slider; most zippers have a size number (1-10) embossed on the back
FixnZip (Medium, Black Nickel) - See Size Guide - Universal Zipper Repair Kit for Jackets, Luggage, Bags - Backpack Zipper Replacement Repair Kit
Backpack Base Replacement - iFixit Repair Guide