Case Study: Custom Waterproof Zipper for a Bag and Luggage Maker in South Korea

Waterproof Zipper for a Bag and Luggage Maker in South Korea

A Bag and Luggage Maker approached us with a waterproof zipper requirement for the South Korea market. The brief was specific: a defined look, a hard launch date and a unit cost that had to survive freight and duty. This case study records what was specified, what went wrong in sampling and how the bulk order was delivered.

The challenge

• A zipper puller that broke under pull test at the warehouse
• Shrinkage that only showed up after the first wash
• MOQ that was quoted per colourway rather than per style

What we specified

How it was resolved

1. We rebuilt the specification around Recycled PET and locked the tolerance before bulk.
2. The finish was moved to Epoxy Doming after strike-off tests showed better durability.
3. A pre-production sample was approved and retained as the golden reference.
4. Production ran with in-line inspection and a mid-run photo report.
5. Cartons were packed to the client's own barcode and ratio specification.

Result

• 20,000 pieces delivered inside the 5-week window.
• Unit cost held within 2.0% of the original quotation.
• Inspection-related rejection stayed under 0.5%.
• The specification is now on file, so reorders reproduce the approved sample.

What we would repeat

Lock the material standard before sampling. Once the base changes, every downstream approval has to be redone and the calendar slips.

Planning something similar?

Share the programme details and we will propose two alternatives — one optimised for unit cost, one for lead time — and let you choose.