A zipper that separates behind the zipper slider is a very common zipper failure mode, esp. on tents, backpacks and luggage. It's an easy fix with
85pcs Zipper Repair Kit, TSV Zipper Fix Replacement Set, Zipper
Zipper - iFixit
Zipper Insertion Pin Replacement - iFixit Repair Guide
Product Care & Repair - Patagonia Australia
Zipper Insertion Pin Replacement - iFixit Repair Guide
Texas Instruments TI-92 Repair Manual : Free Download, Borrow, and
Replace the Slider on a Plastic Tooth Zipper - iFixit Repair Guide
How do I replace a broken zip slider on my Vaude clothing
How do I replace a broken zip slider on my Vaude clothing
Schöffel Easy Jacket Zipper Replacement - iFixit Repair Guide
Replacing the Slider on a Coil Zipper - iFixit Repair Guide