Every insulated cooler bag lives or dies by its edges. In this ~40-second factory clip, our sewing line attaches the exterior piping (外车胶骨 / external roll-edge) to a cooler bag body — the detail that keeps the edge clean, durable, and consistent across a 500-piece run.

Why the piping step matters

Three things EU and US buyers check first on a cooler bag — and all three show up in this short clip:

• Precise stitching — even piping spacing, no puckering, no skipped seams.
• Clean edges — the “做工精细” signal buyers look for before they ask for a quote.
• Consistent quality — we hold the approved sample and check every batch against it (AQL inspection before shipment).

Captured at our Quanzhou plant (BSCI / SEDEX / GRS audited 2025). The clip keeps the natural factory ambient sound — no voiceover — so you hear the real production floor. MOQ from 500 pcs/style for private-label and OEM/ODM programs.

Want this level of edge consistency on your private-label cooler line? Email weir@topsoundco.com.