Marketplace fulfillment guide
FBA places eligible inventory inside Amazon fulfillment, while FBM leaves fulfillment responsibility with the seller. A third-party logistics provider can operate FBM and non-Amazon channels, prepare replenishment for FBA, or support a hybrid model. The best design depends on channel mix, inventory control, service commitments, product constraints, and the cost of exceptions - not on one universal winner.
Decision support
Use the same definitions and evidence across every option. A comparison is not reliable when one path uses best-case assumptions and another uses observed operating data.
| Model | Primary fulfillment owner | Useful when | Control point to examine |
|---|---|---|---|
| FBA | Amazon fulfills inventory sent into its network | Amazon demand and program eligibility justify dedicated stock | Inbound preparation, storage exposure, replenishment timing, and return handling |
| FBM | The seller coordinates delivery and returns | The seller needs direct control or products do not fit the FBA plan | Warehouse execution, carrier coverage, promised handling time, and account health |
| Third-party fulfillment | A contracted 3PL executes the agreed workflows | Multiple channels need shared inventory and operating support | Scope, integrations, inventory accuracy, exceptions, and performance reporting |
| Hybrid | Responsibility is split by channel, SKU, or inventory state | Different products or channels need different economics and controls | Allocation logic, duplicate stock, replenishment, and reconciliation |
Execution
Move to the next step only when the evidence and owner for the current step are clear.
List Amazon, direct-to-consumer, retail, wholesale, and marketplace requirements separately. Record promised handling time, labeling, packaging, returns, and customer-service ownership.
Calculate how much safety stock each model requires and how quickly inventory can move between channels without creating stranded or unavailable units.
Include prep, storage, removal, returns, relabeling, long-term inventory, customer service, carrier claims, and manual reconciliation - not only the base fulfillment fee.
Use fast, slow, oversized, fragile, regulated, bundled, and high-return products. A model that works for one SKU family may not fit the catalog.
Document what happens when inventory is unavailable, a listing changes, replenishment is late, or a warehouse or carrier exception interrupts the primary path.
Use distinct identifiers and reports for FBA, FBM, 3PL, in-transit, return, quarantine, and damaged inventory so availability is not overstated.
Boundaries
Primary sources
