How to fix a stuck or separating zip on a Wildcraft or Skybags backpack

A zip that sticks or splits open behind the slider is one of the most common backpack problems. Most of the time the teeth are fine and only the slider needs help.

For a stuck zip, ease out any trapped fabric, then rub a little wax along both sides of the teeth and work the slider back and forth. If the zip closes but splits open behind the slider, the slider has worn loose; a gentle squeeze with pliers can hold it for a while, but the lasting fix is a new slider. Check your warranty before paying for a repair.

• 1. Free any trapped fabric: If lining or a strap is caught, move the slider back the way it came while gently easing the fabric out with your fingers. Do not yank the slider forward, as forcing it can damage the teeth.
• 2. Clean the teeth: Brush away dust and grit with a dry old toothbrush. In the monsoon, mud and sand dry inside the teeth and make the slider drag.
• 3. Wax the teeth lightly: Rub a candle or wax bar on the front and back of the teeth on both sides, a little at a time. YKK, the zip maker, suggests wax for a slider that does not run smoothly. Use only a little, since too much attracts dirt.
• 4. Work the slider: Move the slider up and down the full length several times. It should loosen up as the wax spreads. Wipe off any extra wax with a dry cloth.
• 5. Check for a worn slider: If the zip closes but the two sides split apart behind the slider, the slider's jaws have spread with wear. Wax will not fix this.
• 6. Squeeze the slider gently (temporary): With small pliers, press the back of the slider very lightly on each side, a little at a time, and test after each squeeze. Outdoor gear makers describe this as a short-term fix. Squeezing too hard can crack the slider or jam it.
• 7. Get the slider replaced: For a lasting repair, have a new slider fitted. If the bag is under warranty, contact the brand first; otherwise a local tailor or bag repair shop can usually do it.