Complete Guide to China Sourcing for Amazon FBA
Product selection · FNSKU labeling · box specs · direct-to-FBA logistics · customs — a practical playbook

Hi, this is GreenFrog Seoul.

"My local market feels saturated. I want to expand to Amazon US/JP/EU through FBA — but I have no idea where to start."

Over the past two or three years, Amazon FBA (Fulfillment by Amazon) has become a serious topic among Korean and other Asia-based sellers. Currency exchange, US average selling prices, and global search volume all favor sellers sourcing from China and selling on Amazon. But once you start, the obstacles pile up fast.

"I've chosen the product, but should I source on 1688 or Alibaba?"
"What's the difference between FNSKU, UPC, and ASIN?"
"Can the Chinese factory ship directly to an Amazon warehouse in the US?"
"Who pays customs and how much?"

Today we walk through the entire Amazon FBA China sourcing process as we run it day-to-day with our clients — from product selection criteria to labeling specs, logistics routes, customs handling, and Seller Central setup. Practical, field-tested, no fluff.

1. What is Amazon FBA — and why it works for sellers sourcing from China

FBA (Fulfillment by Amazon) is Amazon's fulfillment service. You send inventory to Amazon's warehouses, and Amazon handles storage, picking, packing, shipping, returns, and customer service. You essentially focus on "sourcing and marketing" only.

FBA vs FBM (Fulfillment by Merchant)

Why cross-border sellers choose FBA

• Market size: Amazon US has ~240M monthly active users, JP ~55M. Multiples larger than most Asian domestic markets
• AOV: US average order value is 1.5-2x higher than most home markets — the same margin % means more dollars
• FX tailwind: When your local currency weakens, USD revenue translates favorably
• Operational leverage: No US staff needed — fulfillment, CS, and shipping all run automatically
• Made-in-Korea premium: K-Beauty / K-Food carries a premium signal in some categories

2. Product selection criteria — six filters that prevent failure

The most common way to lose money on Amazon is selling "the product I personally want." Data-driven product selection is where FBA begins.

① Size & weight — half of your FBA fee

FBA fees are determined by size tier. With identical selling prices, a tier upgrade can reduce profit by 30-50%.

Ideal FBA product: smaller than a shoebox, under 1-2 lb, non-fragile.

② Margin structure — 30%+ is the safety zone

A 30% markup is not enough on Amazon — ad spend will eat it. Always run this formula:

Selling price − (product cost + freight + customs + FBA fee + 15% referral + 10-20% PPC + 5% returns/loss) = net margin

Aim for 25-35%+ net margin to survive long term.

③ Competition — target categories with under 1,000 average reviews

If the top 10 page-1 listings each have 5,000+ reviews, new entry is essentially impossible. If the average sits between 200-1,000, PPC can break in.

④ Seasonality — 12-month rotation is safest

Christmas/Halloween/Valentine's products carry high margins but high inventory risk. New sellers should pick products that sell evenly year-round.

⑤ Avoid restricted / risky categories

• Restricted: food, OTC drugs, cosmetics, supplements, batteries — gating required
• IP traps: design patents, utility patents, trademarks — avoid keywords like Anker, OXO, MagSafe
• Hazmat: standalone lithium batteries, compressed gas, large liquids — air freight restricted

⑥ Differentiation — "Me Too" products are dead

The era of slapping a 1688 hot product onto Amazon is over. You need at least three meaningful differentiators: color, bundle, packaging, improved spec, etc.

3. 1688 vs Alibaba — which platform fits FBA sourcing

Both are used for Amazon FBA sourcing. Here's how to choose by stage.

Practical workflow for FBA sellers

• Research / sampling: Use 1688 for price benchmarks + Alibaba for OEM-capable factories
• Test order (100-300 units): 1688 with stock colors for fast validation
• Production (500-5,000): Alibaba with Trade Assurance + proper invoice
• Direct-to-FBA: Alibaba verified factories + Amazon-ready labeling/packaging

4. Product research tools — Jungle Scout · Helium 10 · Keepa

FBA starts with data. Picking products by gut feeling almost guarantees losses. Here are the three standard tools.

Jungle Scout

• Strengths: Beginner-friendly UI, product database, keyword tracking, supplier database
• Pricing: $49-$129 per month
• Use for: New product discovery + category BSR trend tracking

Helium 10

• Strengths: Keyword tools (Cerebro, Magnet), listing optimization (Frankenstein, Scribbles), advertising tools
• Pricing: $39-$249/month, with a free tier
• Use for: Keyword research + listing optimization + competitor PPC analysis

Keepa

• Strengths: 1-year price/BSR graphs, seller change history, alerts
• Pricing: €19/month — best value
• Use for: Validating real demand for a target product. Essential for new sellers

Recommended tool combinations

5. Meeting FBA specs — FNSKU · Labeling · Box Requirements

Labeling and box specs cause more FBA failures than anything else. A single mistake leads to receiving rejection, disposal, or per-unit labeling fees ($0.55+).

FNSKU vs UPC vs ASIN

Key: FBA boxes must carry FNSKU labels. UPC alone leads to commingling — your inventory gets mixed with other sellers' and disasters follow. Always download FNSKU labels from Seller Central → "Print Item Labels" and send to your factory.

FNSKU label standard

• Size: 1" × 2" (~25mm × 50mm) or 30mm × 60mm recommended
• Position: On product or polybag exterior, not covering other barcodes
• Quality: Black ink on white background, scanner-readable
• Override: Must cover existing UPC or be on the polybag separately

Product packaging requirements

• Polybag: 1.5mil+ thickness + Suffocation Warning + required if 5"+ in any dimension
• Liquids: Double-sealed + leak-proof tested
• Powder/liquid food: Additional outer seal
• Sharp items: Cap or protective sleeve
• Multi-component: "Sold as Set, Do Not Separate" label

FBA carton (box) specs

• Max size: 25" × 25" × 25" per box; over 25" on any side = oversize
• Max weight: 50 lbs (22.7kg). If exceeded, "Team Lift" label required
• Box labels: FBA Shipment Label outside + UPS/courier label
• Corrugate spec: 32 ECT or 200 lb burst minimum (long transit durability)

6. Logistics routes — China direct-to-FBA vs routing through Korea

FBA logistics generally fall into three scenarios with different cost / time / risk profiles.

① China → Amazon warehouse direct (Direct to FBA)

Most common and cost-efficient. The Chinese factory (or freight forwarder) ships directly to Amazon US/JP/EU warehouses.

• Pros: No Korea routing cost, simplest, fastest
• Cons: Once it leaves the factory, no fixes; labeling must be perfect
• Routes: Shenzhen/Guangzhou → US LAX (sea 18-25 days, air 5-8 days)
• Cost: Sea LCL $80-$150/CBM, air $4-$8/kg

② China → Korea → Amazon warehouse (Korea routing)

Inspect, repackage, and label in Korea before sending to Amazon. Best for new factories or QC-sensitive categories.

• Pros: Korean import-clearance/tax handling, hands-on inspection, partial domestic stocking
• Cons: Double freight + customs, +1-2 weeks
• Best fit: Unverified factories, dual-market operation, high-value SKUs

③ China 3PL inspection + direct-to-FBA

A China-based third-party inspector (QIMA, V-Trust, AsiaInspection) inspects, labels, and ships directly to Amazon. The most balanced option.

• Cost: $300-$500/inspection + $0.10-$0.30/unit labeling
• Lead time: +2-3 days vs direct
• Best fit: Production-stage runs (300+ units)

Logistics matrix

7. Inspection & QC — FBA returns are very expensive

Once goods are received at FBA, returns / re-labeling / disposal all cost money. The same defect rate produces 2-3x the loss compared to a domestic D2C channel.

Real cost of an FBA claim

Pre-shipment inspection checklist (in China)

• 100% functional check (or AQL 2.5 sample plan)
• FNSKU label is on every unit (position + print quality)
• Polybag has Suffocation Warning printed in English
• User manual is included in English / target language
• FBA Shipment Label is correctly applied to the outside of each box
• Units per carton (QTY/CTN) matches Seller Central input
• Each box ≤ 50 lb, otherwise Team Lift label applied
• Drop test (50cm, 6 sides) passed
• Product / box photos sent to seller
• Inspection report from factory or 3PL is provided

8. Customs & taxes — US / Japan / EU handling

For FBA, the seller becomes the Importer of Record (IOR). Mishandling customs leads to clearance delays, penalties, and account suspensions.

US FBA customs essentials

• Section 321 (de minimis): Up to $800 per recipient per day can clear duty-free. Note: Highly volatile policy in 2025-2026, especially for China-origin goods — verify at the time of shipment
• Formal entry: Above $800, formal entry with HTS-based duty
• Section 301 tariffs: 7.5-25% extra on China-origin (varies by category, volatile)
• EIN / Tax ID: Required to register as IOR. Korean / non-US entities can also obtain EIN
• Customs Bond: Required when value exceeds $2,500 (single or annual continuous bond)

Japan FBA customs essentials

• Small-value exemption: Customs value ≤ ¥10,000 generally exempt (with exclusions)
• Formal entry: Over ¥10,000 → duty + 10% consumption tax
• ACP (Attorney for Customs Procedures): Non-resident sellers must appoint a customs proxy
• JCT (consumption tax): Required for sales over ¥10M/year, with qualified invoice issuance

EU FBA customs essentials

• VAT: 19-25% by country. With IOSS, sellers self-declare VAT for ≤ €150 shipments
• EORI: Required for EU clearance. Sellers commonly register UK / DE / NL
• Duty: 0-15% by HS code
• VAT registration: PAN-EU operation requires multi-country registrations (€50-€150/month/country)

HS code matters more than you think

The same product can have 0% to 25% duty depending on HS code. Don't blindly trust the factory's HS — review with a Korean broker or US customs broker.

9. Amazon account setup — Seller Central / Brand Registry / Ads

Beyond sourcing, your Amazon account infrastructure needs to be set up properly for stable operations.

Seller Central registration

• Plan: Individual (free monthly, $0.99/sale) vs Professional ($39.99/month, no per-sale fee) — Professional needed at 50+ sales/month
• Documents: Business registration, English-address proof (utility / bank statement), credit card, business bank account info
• Marketplaces: NA (US/CA/MX), EU (UK/DE/FR/IT/ES, etc.), JP — separate registration each
• Review time: 2-4 weeks usually, with a Video Verification step

Brand Registry

If you're serious about Amazon, trademark registration is essentially required.

• Benefits: A+ Content, Brand Story, Sponsored Brand ads, counterfeit reporting
• Requirements: Trademark in the target country (some allowed in pending status, IP Accelerator speeds it)
• Cost: US trademark ~$250-$500 + attorney fees; Madrid System after Korean filing is efficient

PPC basics

• Sponsored Products: Search results / detail page ads. New sellers run 80% of budget here
• Sponsored Brands: Brand exposure ads (Brand Registry required)
• Sponsored Display: Off-Amazon and competitor product page ads
• ACoS: ad spend ÷ ad sales. Breakeven ACoS = your margin %. Initially you'll bleed at 30-50% to gather reviews

10. Common mistakes — prevention checklist

Patterns we see repeatedly with new sellers.

Product selection mistakes

• Picked based on competitor BSR / reviews without margin math → margin under 30%
• Chose "what I personally like" → no demand
• Entered with no differentiation (Me-too) → only price war remains
• Shipped without IP review → Listing taken down via IP Complaint
• Picked a bulky/heavy first product → FBA fees ate the margin

Sourcing / labeling mistakes

• Sent with UPC only (no FNSKU) → commingling, inventory mix-up
• Polybag thinner than 1.5mil → receiving rejection
• Missing Suffocation Warning → labeling fee charged after receipt
• Box over 50 lb without Team Lift label → rejection
• Units per carton differs from Seller Central input → "Discrepancy", hard to claim
• Carton outside reveals product details too clearly → customs / theft risk

Logistics / customs mistakes

• Used factory's HS code; turned out to be a different category → back duties
• Section 321 split shipments treated as one entry → penalties
• Pushed IOR onto forwarder without an EIN → no recourse later
• Shipped over $2,500 without a Customs Bond → clearance held
• Delayed Japan/EU VAT registration after sales → cumulative back-tax

Operations mistakes

• Started with 0 reviews and no ads → no impressions, fades after 90 days
• Copy-pasted competitor keywords blindly → ad spend explosion
• Tried fake reviews / review buying → account suspension
• Stocked out → BSR collapse, 2-3 months to recover
• Launched US/JP/EU simultaneously → unable to handle any one well
• Single-product dependency → unprotected against seasonality / competition

11. Step-by-step roadmap (3-month plan)

Month 1: Research + first factory match

• Week 1: Narrow to 3 categories + 1-year Keepa validation
• Week 2: Helium 10 keyword analysis + 5 competitor breakdowns
• Week 3: Contact 5-10 factories on Alibaba/1688 + price matrix
• Week 4: Receive 3 samples + quality comparison + select 1-2 factories

Month 2: Production + labeling prep

• Week 1: Seller Central registration + draft listing + UPC purchase
• Week 2: Test production order 100-300 units + FNSKU PDF sent
• Week 3: Production in progress + packaging design sign-off + cert/HS review
• Week 4: Pre-shipment inspection + final box spec confirmation

Month 3: Shipping + receiving + first ad campaign

• Week 1: Ship via Korea routing or direct + clear customs
• Week 2: Amazon receiving + Seller Central verification
• Week 3: Activate listing + photos / A+ Content + start PPC
• Week 4: First sales + review monitoring + reorder decision

12. Master checklist

• Understood FBA vs FBM and chose FBA
• Product fits Small/Large Standard size tier
• Full-cost simulation shows 25-35%+ net margin
• Validated 1-2 years of BSR data via Keepa
• Average competitor reviews under 1,000
• Reviewed IP (trademark / design) infringement risk
• Used 1688 for benchmarks + Alibaba for OEM-capable factory match
• Bought UPC from GS1 + generated FNSKU in Seller Central
• Sent FNSKU PDF + position spec to factory
• Confirmed polybag ≥ 1.5mil + Suffocation Warning
• Box size / weight within FBA limits
• Units per carton matches Seller Central input
• Chose first-order method: direct vs Korea routing vs 3PL QC
• Reviewed HS code with broker
• Registered EIN / EORI / JCT / IOR as needed
• Customs Bond / IOSS verified by country
• AQL standard stated in PI
• Drop test + box strength test done
• Seller Central + Brand Registry + PPC campaigns ready
• First-90-day ad budget reserved
• Reorder cycle set up to prevent stockouts
• 2nd-3rd product scenarios already in pipeline

Wrap-up — FBA is a marathon. Don't end with the first product.

Amazon FBA is one of the largest global opportunities for Asia-based sellers, but the rules are completely different from a domestic D2C marketplace. Data, label accuracy, logistics reliability, and ad efficiency must all click together for margin to appear.

To recap:

• FBA's essence: Fulfillment automation → seller focuses on sourcing + marketing
• Product selection: Six filters — size, margin, competition, seasonality, regulation, differentiation
• Platforms: 1688 for benchmarks + Alibaba for production = standard
• Tools: Keepa is essential; add Jungle Scout / Helium 10 over time
• Labeling: FNSKU labels are the start and end of FBA compliance
• Logistics: First order through Korea or 3PL QC; direct after stabilization
• Customs: Set up Section 321/VAT/EORI/EIN IOR infrastructure in advance
• Operations: Seller Central + Brand Registry + 90-day PPC investment
• Reality: First product = tuition; second product = profit (typical pattern)

GreenFrog Seoul partners with sellers from FBA product matching, factory validation, FNSKU/box spec coordination, Korea-routing inspection, all the way to direct-to-FBA operations. Whether you're starting from zero or running unprofitable listings, feel free to reach out.