Case Study: Custom Reverse Coil Zipper for an Amazon Private Label Seller in China

Reverse Coil Zipper for an Amazon Private Label Seller in China

An Amazon Private Label Seller approached us with a reverse coil zipper requirement for the China 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 spec that lived in an email instead of a tech pack
• Elastic that lost recovery after three washes
• Shade drift between the approved lab dip and the bulk lot

What we specified

How it was resolved

1. We rebuilt the specification around Stainless Steel and locked the tolerance before bulk.
2. The finish was moved to Anodised Finish 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

• 50,000 pieces delivered inside the 5-week window.
• Unit cost held within 4.5% of the original quotation.
• Inspection-related rejection stayed under 1.0%.
• The specification is now on file, so reorders reproduce the approved sample.

What we would repeat

Keep one accountable owner on both sides. Most delays come from hand-offs, not from machines.

Planning something similar?

Send the reference sample or tech pack and we will come back with a costed specification, a sampling timetable and the compliance documents your market requires.