HTS Codes, Duty Rates & Common Classification Mistakes
Importing vacuum insulated tumblers (also known as thermos flasks) into the United States can be confusing due to different materials, constructions, and duty treatments. Choosing the wrong HTS code may result in overpaying duties, shipment delays, or customs audits.
This guide explains how vacuum insulated tumblers are classified in the U.S., which HTS codes apply to different materials, and how to estimate duties using real tariff data.
1. What Is a Vacuum Insulated Tumbler?
A vacuum insulated tumbler is typically a double-wall container with a vacuum layer designed to keep beverages hot or cold. Most consumer products sold on Amazon or through U.S. retailers are made of stainless steel, have no glass inner, and hold less than 1 liter.
For a detailed product definition and classification overview, see:
👉 Vacuum Insulated Thermos Flask – Product Details
https://www.fiowind.com/CN/US/Thermos-Flask
2. Correct HTS Code for Most Vacuum Insulated Tumblers
✅ HTS 9617.00.1000 — Vacuum Flasks (Non-Glass Inner, ≤1L)
For the vast majority of consumer vacuum tumblers, the correct U.S. HTS code is:
HTS 9617.00.1000 — Vacuum flasks and other vacuum vessels, complete; excluding glass inners, capacity not exceeding 1 liter.
You can verify current U.S. duty rates (including additional trade measures) here:
👉 HTS 9617.00.1000 – U.S. Import Duty from China
https://www.fiowind.com/duty/CN/US/9617-00-1000
This is the preferred classification for stainless steel vacuum tumblers and thermos cups used for beverages.
3. Why Material Matters: Commonly Confused HTS Codes
Many importers overpay duties because they classify products based on material alone, instead of construction and intended use. Below are HTS codes that are often confused with vacuum tumblers — and why they usually don’t apply.
❌ Steel Containers (Not Vacuum Tumblers)
HTS 7310.10.0090 / 7310.10.0005
These codes cover iron or steel containers, such as industrial drums or cans (up to 300 liters), not consumer vacuum drinkware.
- HTS 7310.10.0090 – Duty reference
👉 https://www.fiowind.com/duty/CN/US/7310100090 - HTS 7310.10.0005 – Product scope reference
👉 https://www.fiowind.com/CN/US/7310100005
Using these codes for vacuum tumblers can trigger extremely high duties and customs scrutiny.
❌ Plastic Containers
HTS 3923.90.0080 applies to certain plastic containers, but not to vacuum insulated tumblers with double-wall construction.
👉 Plastic container duty reference:
https://www.fiowind.com/duty/CN/US/3923900080
If your product is a simple plastic water bottle, this may apply — but once vacuum insulation is involved, classification usually shifts to HTS 9617.
❌ Glass Articles or Inner Components
HTS 7020.00.4000 is for certain glass articles or components, not finished vacuum insulated tumblers sold as consumer products.
👉 Glass duty reference:
https://www.fiowind.com/duty/CN/US/7020004000
Do not use this code unless you are importing glass parts only, not completed drinkware.
4. How Duties Are Actually Calculated
Many HTS codes appear to have low base duty rates, but effective duty may be much higher due to:
- Additional tariff measures
- Country-of-origin rules
- Temporary trade actions
For example, when importing vacuum tumblers from China under HTS 9617.00.1000, the total duty can be significantly higher than the base rate alone.
👉 Always check the latest calculated duty rate here before shipping:
https://www.fiowind.com/duty/CN/US/9617-00-1000
5. Practical Tips to Avoid Costly Mistakes
✔ Classify based on function and structure, not just material
✔ Confirm whether the product has a vacuum layer
✔ State capacity clearly on invoices (e.g., “≤1L”)
✔ Keep product specs and photos ready for customs review
✔ Verify HTS codes before finalizing landed cost
6. Summary: Which HTS Code Should You Use?
| Product Type | Recommended HTS |
|---|---|
| Stainless steel vacuum tumbler (≤1L) | 9617.00.1000 |
| Industrial steel container | 7310.10.xxxx |
| Plastic container (non-vacuum) | 3923.90.0080 |
| Glass component only | 7020.00.4000 |
Final Advice
If you are unsure whether your product qualifies as a vacuum insulated tumbler or falls under another category, verify the HTS code before shipping. A small classification mistake can easily double your duty cost.
👉 Use Fiowind’s duty lookup pages as a pre-classification check before customs clearance.