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Amazon FBA vs. FBM: Which Fulfillment Model Fits Your Brand?
FBA and FBM each have real trade-offs around cost, control, and Prime eligibility. Here's how to think through storage fees, margins, product size, and order volume so you can pick the model — or the mix — that protects your profit.
May 14, 2026 · By PrepFort TeamThe core difference
With Fulfillment by Amazon (FBA), you send inventory to Amazon and they store, pick, pack, and ship it, and handle most customer service and returns. With Fulfillment by Merchant (FBM), you keep inventory and fulfill each order yourself or through a third-party logistics partner. Both can win the Buy Box and, with Seller Fulfilled Prime, both can carry the Prime badge, so the decision comes down to economics and control.
When FBA makes sense
FBA is strong for small, light, fast-moving products where Amazon's fulfillment fees are reasonable and Prime speed drives conversion. If your catalog turns quickly and you don't want to run a shipping operation, FBA removes a lot of day-to-day work. The trade-off is less control over how your product is stored and packed, plus long-term storage fees on anything that sits.
When FBM makes sense
FBM tends to win for oversized, heavy, slow-moving, or high-value items where FBA fees and storage costs eat your margin. It also gives you control over branded packaging, inserts, and the unboxing experience, and it keeps your inventory in one place if you sell across multiple channels. The catch is that you're responsible for hitting Amazon's delivery speed and tracking expectations.
Why many brands run both
Plenty of sellers split their catalog: FBA for the small, quick items and FBM for the bulky or seasonal ones. Running both spreads risk if you hit FBA storage limits or restocking caps, and it keeps you shipping even when Amazon's network is congested during peak season.
How a 3PL supports either path
A capable 3PL prepares FBA shipments to spec and fulfills your FBM orders from the same warehouse, so you can shift volume between models without rebuilding your operation. That flexibility lets you chase margin product by product instead of forcing everything into one channel.