A 3PL ships every channel's orders from its own warehouse, in your packaging, under rules you set, while Amazon FBA stores your stock in Amazon's network and ships your Amazon orders with the Prime badge, under Amazon's rules and fee schedule. FBM is not a warehouse: it is the setting on an Amazon listing that says someone other than Amazon ships the order, and that someone is you or your 3PL. Many DTC brands that sell on Amazon end up running both, a 3PL for the website, TikTok Shop and FBM orders, and FBA for the Prime badge, replenished from the same stock.
What a 3PL, FBA and FBM each do
A 3PL receives your inventory, stores it, picks and packs each order and hands it to a carrier, for every channel you connect: Shopify, Amazon, TikTok Shop, wholesale. The box, the insert, the carrier and the cutoff are written into your agreement. You see the stock by SKU, and you can take it back.
Fulfillment by Amazon runs the other way. You prep and label your units to Amazon's rules and ship them into Amazon's network, and Amazon stores them and ships your Amazon orders. Amazon's FBA page says the fulfillment cost covers picking, packing and shipping as well as customer service and returns, and that FBA products are eligible for free two-day shipping through Prime, as of October 2026. You get the badge and give up the box.
Fulfilled by Merchant is not a place. It is the setting on an Amazon listing that says the seller ships the order, not Amazon. Amazon's FBM page describes it as fulfilling orders from your own warehouse, for your whole catalog or in combination with FBA, as of October 2026. Your own warehouse can be a spare room or a 3PL. At a 3PL, an FBM order arrives in the WMS like a Shopify order and ships on the same cutoff, in your packaging.
The comparison, line by line
| What you are deciding | Amazon FBA | A 3PL, shipping DTC and FBM |
|---|---|---|
| Which orders it ships | Amazon orders. Other channels only through Multi-Channel Fulfillment | Every channel you connect: Shopify, Amazon FBM, TikTok Shop, wholesale |
| Who owns the box | Amazon, unless the product is certified to ship in its own packaging | You. Your boxes, mailers and inserts, packed to your spec |
| Prime badge | Yes, on FBA offers | Only through Seller Fulfilled Prime, after prequalifying and a trial |
| Where the stock sits | Across Amazon's network, placed by Amazon | One building you can visit, counted by SKU on a dashboard |
| How the bill is built | Per unit by size and weight, storage per cubic foot, plus aged inventory, placement, returns processing and removal lines | Per order or per item, storage per cubic foot or per pallet, per returned parcel, receiving, packaging as used, postage per shipment |
| Peak | Storage rates can be higher in the holiday months | Set in your agreement. At YNK, no seasonal or peak surcharges on handling or storage |
| Returns | Amazon handles it. You see the outcome, not the parcel | Your 3PL receives and grades it under your rules, and your store fires the refund |
| Customer service on the order | Amazon, for FBA orders | You, through your store, with the 3PL's data |
| Getting stock back out | A removal order, charged per item | Yours to move. The steps are set in your agreement |
Control over the box: branding and packaging
An FBA order leaves Amazon's building in packaging Amazon adds. Your brand is the product inside and the listing page. The way around it is Amazon's Ships in Product Packaging program, which delivers FBA orders in your own packaging without Amazon-added material, but each product group has to pass a packaging test and be enrolled, and the customer can still add Amazon packaging at no extra cost, as of October 2026.
At a 3PL the box is a rule in the WMS. Branded mailer for single-unit orders, carton for multi-unit, a card in every box, a sample in the first order of a subscription. The 3PL stores your materials and packs to the spec. The unboxing is the one physical touch you get with a customer, and on FBA you have handed it to Amazon.
One inventory pool or two
Multi-Channel Fulfillment is Amazon shipping your non-Amazon orders out of FBA stock. Amazon's MCF guide says MCF inventory goes into the same network as FBA, so one pool can serve your Amazon orders and your other channels, that those orders default to unbranded packaging unless that causes longer shipping and delivery times, with an option to ship only in blank boxes on eligible products, and that you handle customer service on MCF orders yourself, as of October 2026. One pool, then, but under Amazon's rules, and a blank box is the most your website customer will see.
A 3PL runs the pool the other way around. One pool in one building, counted by SKU, and every channel draws from it: the website, TikTok Shop, Amazon FBM, wholesale. When FBA needs replenishing, the 3PL pulls from the same pool, preps the units to Amazon's requirements and sends a shipment in. FBA becomes a working stock you top up. Two pools means two counts, two sets of slow movers, and a size sold out on your site while it sits at Amazon.
How the fees are built
Amazon's bill and a 3PL's bill have the same lines with different units. Amazon's FBA fee guide says fulfillment costs are based on the product's weight and size, storage is charged monthly on the cubic feet your inventory takes up, and storage rates can be higher in the holiday months, as of October 2026. The FBA page lists the rest, as of October 2026: an aged inventory charge, billed monthly on items stored for more than 181 days; a returns processing charge on orders where Amazon provides free return shipping; a per-item charge to have inventory returned, disposed of or liquidated; and an inbound placement fee for distributing stock to fulfillment centers near customers. On top sits the referral fee, a percentage of the sale price set by category, paid on every Amazon sale whether FBA or FBM ships it, as of October 2026.
Read the units before the numbers. FBA bills per unit, so every extra unit in an order is another fulfillment charge. A 3PL bills per order or per item, which decides the bill on multi-unit orders. FBA storage is per cubic foot at a rate that changes with the season; a 3PL's is per cubic foot, per pallet or per bin, so ask which, and whether it moves in peak. FBA has no receiving line, but it has prep and labeling before the shipment goes in, plus placement and aged inventory lines. 3PL pricing, line by line walks the 3PL side, and how to compare 3PL quotes on your own data shows the data pack to run through both schedules.
Returns: who opens the parcel
On FBA, Amazon handles the return end to end. You do not see the parcel, only the outcome on a report and the returns processing charge where it applies.
On FBM and your own site, the parcel comes back to the 3PL's floor. Amazon's FBM page says US sellers are enrolled in Amazon's prepaid return label program, that returns inside Amazon's policy are authorized automatically, and that return requests need a response within 24 hours, as of October 2026. The 3PL receives the parcel, grades it, restocks or sets it aside under your rules, and tells your store so the refund can fire. You get the data: what came back, why, and in what condition. How 3PL returns processing works has the full sequence.
The common answer: both, with FBA replenished from the same stock
Most DTC brands on Amazon do not pick one. Amazon's own FBA versus FBM comparison says many sellers use both methods on a per-product basis, as of October 2026. The setup that works on the floor runs in this order, and it doubles as a fallback: if FBA stops shipping, the website still ships.
- 01Keep the master inventory at the 3PL. Every unit lands there first, scanned in and counted on one dashboard.
- 02Put your fast Amazon SKUs in FBA for the Prime badge. Send a working stock, not the whole production run.
- 03List slow, bulky and seasonal SKUs as FBM, shipped by the 3PL from the master stock, with no FBA storage or aged inventory charges.
- 04Set a replenishment trigger per FBA SKU. When stock hits it, the 3PL preps, labels and ships a replenishment from the master stock before the listing goes dark.
- 05Route every other channel to the 3PL: Shopify, TikTok Shop, wholesale. One pool, one count.
- 06Keep an FBM offer ready on your FBA SKUs, so when FBA runs dry the 3PL keeps the listing shipping.
- 07Watch two numbers: days of cover at FBA per SKU, and the age of the oldest units there against the aged inventory threshold on Amazon's FBA page, as of October 2026.
How FBA prep and FBM orders run on our floor
Shopify, Amazon and TikTok Shop connect natively to our WMS, so Amazon FBM orders ship from Elmwood Park on the same 12pm ET cutoff as your Shopify orders: in by 12pm ET, shipped the same business day, otherwise within one business day, two to three in peak. Pick and pack error runs under 0.3% across 1.2M+ orders a year, every unit scan-verified before it goes in the box. Your boxes, mailers and inserts are welcome: we store them and pack to your spec.
FBA prep runs from the same stock as your DTC orders: labeling, bundling, and carton and pallet compliance to Amazon's current prep requirements, checked before the pallet leaves the dock. Your Shopify, Amazon and TikTok Shop orders draw on one inventory pool, and FBA replenishment ships from it. Relabeling a season of stock runs as special-project labor, $35 per hour as an estimate. The FBA prep requirements checklist lists what Amazon asks for.
The rate card is the same for all of it: handling $3.00 per order, pick, pack and ship, one handling fee per order as the baseline whatever the unit count; storage $0.65 per cubic foot per month on the space you use; returns $3.00 per parcel, with refunds able to fire on receipt through your store. Receiving is billed hourly, packaging as used, no setup fee. These are estimates, confirmed in your quote. There are no seasonal or peak surcharges on handling or storage, and postage is billed semi-monthly per shipment, at extremely competitive carrier rates. Try your own numbers in the cost calculator.
Questions brands ask about FBA and a 3PL
Can a 3PL ship my Amazon orders?
Yes, as Fulfilled by Merchant. The listing is set to merchant fulfilled, the order syncs to the 3PL like a Shopify order, and it ships in your packaging. At YNK, FBM orders ship on the same 12pm ET cutoff as every other channel.
Do I lose the Prime badge if I move a SKU out of FBA?
On that SKU, yes, unless you qualify for [Seller Fulfilled Prime](https://sell.amazon.com/programs/seller-fulfilled-prime), which Amazon's page says requires prequalifying and passing a 30-day trial, as of October 2026. Most brands keep their fast Amazon SKUs in FBA for the badge and ship the rest FBM from the 3PL.
Can my 3PL replenish FBA from the same stock?
Yes, and that is the common setup. The master stock sits at the 3PL, and when an FBA SKU runs low the 3PL preps, labels and ships a replenishment from the same pool. At YNK, FBA prep runs from the same stock as your DTC orders.
Is FBA cheaper than a 3PL?
It depends on your units per order, your cube, your return rate and how long stock sits. FBA bills per unit with seasonal storage and aged inventory lines; a 3PL should price your last three months of orders at its unit. Run both on your own data.
Should I use Multi-Channel Fulfillment for my Shopify orders instead?
You can, and the stock is one pool. But [Amazon's MCF guide](https://sell.amazon.com/blog/multichannel-fulfillment) says packaging is unbranded by default and you handle customer service on those orders, as of October 2026. If the unboxing is part of your brand, a 3PL gives you the box and the data.
Related: Amazon FBA prep from the same stock as DTC · Amazon FBA prep requirements checklist · 3PL pricing, line by line