About Us — WINTHERMO Vacuum Flask Factory, Yongkang China

About the factory

The flask factory in Yongkang

WINTHERMO was founded in 2023 in Yongkang, Zhejiang — the cluster that supplies most of the world's vacuum flasks. We finish 600,000 insulated bottles every month, almost all of it for export. Our main market today is South America.

Founded: 2023
Location: Yongkang, Zhejiang, China
Address: No.6 Fengxiang Road, Gushan Town
Monthly capacity: 600,000 units
Main market: South America
Nearest port: Ningbo / Shanghai

Factory building900×1200

Product range

What we manufacture

Car tumblers, yerba mate cups, large-capacity bottles, sports bottles, kids bottles and sets — double-wall stainless steel, 304 or 316, from 12oz to 64oz.

Stainless Steel Yerba Mate Cup

Stainless Steel · Yerba Mate Cup · for the Argentine market

stainless steel→

Stainless Steel Car Tumbler Set — 40oz / 1183ml

Stainless Steel · Car Tumbler · 40oz / 1183ml

stainless steel→

304 Stainless Steel Vacuum Flask with Handle & Dual-Drink Lid

304 Stainless Steel · Vacuum Flask

304 steel→

304 Stainless Steel Large-Capacity Bottle with Handle

304 Stainless Steel · Large-Capacity Bottle

304 steel→

304 Stainless Steel Yerba Mate Cup Set — 800ml + 160ml

304 Stainless Steel · Yerba Mate Cup · 800ml + 160ml

304 steel→

Plastic Kids Water Bottle with Straw Lid

Plastic · Kids Water Bottle

plastic→

Workshop

Vacuum line

Logo & coating

Testing

Packing

Replace the six frames above with real factory photos — buyers check these before they reply.

Compliance

Test reports & certifications

Quality control

Vacuum and leak testing on every unit, holding-temperature verification by batch, full visual inspection before packing. Third-party inspection at our factory is welcome.

LFGBFDARoHSISO 9001

[Keep only the certificates you actually hold — misstating food-contact certification is a legal risk in export markets.]

OEM / ODM enquiries

Send a photo, drawing or a physical sample of what you want. We confirm feasibility, tooling cost if any, and lead time in writing before you commit to anything.

Ask on WhatsApp