A broken zipper can be annoying, but fixing it is often simple. First, check if the zipper teeth are fine. If the slider came off, carefully place it back on both sides of the track. If the teeth won’t close, use pliers to apply slight pressure to the slider. For a stuck zipper, rub a pencil or soap along the teeth to ease its smooth sliding. If teeth are missing, replacing the zipper... https://backpacktips.com/how-to-fix-a-broken-zipper-complete-guide/