FBA vs 3PL vs Shipping It Yourself: What Stays on Your Floor

None of the three removes warehouse work. Fulfillment by Amazon (FBA) takes picking, packing, shipping, customer service and returns for orders it ships, but since January 1, 2026 Amazon no longer offers prep and item labeling for FBA shipments in the US, so any prep a unit needs is done before it reaches Amazon. A third-party logistics provider (3PL) takes the physical work you contract it for, while your channels and books run on a count it keeps. Shipping it yourself keeps the physical work and the physical count under your control.

So the useful question is not "which one gets rid of the warehouse." It is "which work stays with us, and in which building."

What does each model actually take off your hands?

Here is the work, step by step, and who does it under each model.

Amazon describes FBA as a service where it will "pick, pack, and ship orders, as well as handle customer service and returns," with storage "charged monthly based on the space your inventory occupies in Amazon's fulfillment network." The inbound side is yours: Amazon's inbound steps include "preparing, packing, and labeling your inventory" before you "Send shipment to Amazon." Amazon also offers Multi-Channel Fulfillment, which uses "your Fulfillment by Amazon (FBA) inventory to fulfill customer orders from other sales channels—including your own website."

For a neutral list of what warehousing providers offer, the US Bureau of Labor Statistics description of warehousing and storage (NAICS 493) is a useful reference. Its definition of the warehousing and storage industry (NAICS 493) lists the logistics services such businesses may provide: "labeling, breaking bulk, inventory control and management, light assembly, order entry and fulfillment, packaging, pick and pack, price marking and ticketing, and transportation arrangement." The word that matters is "may". What your 3PL does is what your contract says, and everything else stays with you.

What changed for FBA in 2026?

Three changes in 2026, plus one older constraint, shape the floor work behind FBA. All come from Amazon's own announcements.

Prep and labeling moved back to you. Amazon's Selling Partner API changelog, posted July 28, 2025, says prep and item labeling services for FBA shipments "will no longer be available in the US marketplace" starting January 1, 2026. Before that date, a brand could pay Amazon to prep and label units after they arrived. After it, units have to arrive ready, and Amazon's own prep guide says it "may refuse, return, or repackage any product delivered to a fulfillment center with inadequate or non-compliant packaging at your expense."

Barcode rules depend on who you are. Amazon ended commingling for inventory shipped on or after March 31, 2026. Commingling is when Amazon fulfills an order "using exact product matches from the closest available inventory in the Amazon fulfillment network, even if that inventory belonged to a different seller." With it gone, brand owners enrolled in Amazon Brand Registry as a Brand Representative "will no longer need to apply Amazon barcode stickers" to products that already carry a manufacturer barcode such as a UPC, while resellers without that enrollment "will now be required to use Amazon barcode stickers for products even if they have a manufacturer barcode." Whether your floor runs a label step for every FBA unit now depends on which side of that line you sit. (A manufacturer barcode such as a UPC carries a GS1 product number, the GTIN.)

Fees went up, without new fee types. Amazon's 2026 fee update, announced in October 2025, says FBA fees increase "by an average of $0.08 per unit sold," effective January 15, 2026, and that "There will be no new FBA fee types in 2026." Storage is charged on space, aged inventory carries its own charge, and how you send inbound shipments affects cost through the FBA inbound placement service fee. Amazon also introduced a low-inventory-level fee on April 1, 2024; check your fee preview for whether it applies to your products. Where it does, it gives you a reason not to run FBA stock too lean, which means sending replenishment on a schedule. Expect Amazon's 2027 fee announcement to change some of this.

Space is capped, and has been since before 2026. Amazon announced in 2023 that it would set "a single monthly limit to determine how much inventory sellers can send to and store at Amazon," measured in cubic feet. The method may have been adjusted since, so check the current limits in your account. The point for planning is that some stock will always wait somewhere else until there is room at Amazon.

Put these together and the picture changes. Receiving supplier freight, building cartons and timing shipments to Amazon were always the seller's job. Since January 1, 2026, prep and labeling in the US join that list, because they can no longer be handed to Amazon at the fulfillment center. So for a US brand, choosing FBA is not choosing to have no warehouse. It is choosing to run a feeder operation: receive, prep, label where required, build cartons, and ship to Amazon on a cadence set by its capacity limits and fees. That operation is your own floor, a 3PL or prep provider, or a supplier that ships ready-to-sell units. For many brands the real question is not FBA versus a warehouse. It is which operation feeds FBA.

What does a 3PL leave you?

A 3PL takes the physical work, and your contract may make it answerable for accuracy and shrink. But your sales channels and your books still run on its number, so checking that number stays with you.

With a 3PL you keep three jobs:

1. Telling it what is coming. The 3PL can only receive cleanly against what it was told to expect. Purchase orders and inbound notices still start with you.
2. Reading its numbers. The 3PL holds the physical count. Your sales channels and your books need that count, so its stock reports become an input you check, not a fact you accept.
3. Reconciling. When your record and the 3PL's disagree, someone on your side decides which one is right and why. That is the same discipline as an internal cycle count, carried out across a contract boundary. Inventory accuracy does not get outsourced along with the shelves.

If you also sell wholesale or through your own stores, check whether your 3PL handles those orders. If it does not, part of your stock stays under your own roof, and the 3PL becomes one location among several rather than a replacement for your floor.

What does shipping it yourself demand?

Everything in the left-hand column of the table, plus the standards of every channel you ship for.

Amazon spells out what merchant fulfillment (FBM) means for Amazon orders. You "store, pack, and ship items," handle "cancellations, returns, refunds, and customer service," confirm shipment "within your stated handling time" and respond to return requests "within 24 hours." As of 2026, seller-fulfilled listings carry a 90% on-time delivery rate requirement. Since February 28, 2026, if you fall below it, Amazon deactivates the listings with the most impact on the drop rather than every seller-fulfilled listing, though it may deactivate all of them if your rate is "significantly below 90%" or you miss the requirement repeatedly. If you want the Prime badge on orders you ship yourself, Seller Fulfilled Prime requires passing a 30-day trial against Amazon's performance requirements.

What you get for the work is one physical count that every channel's available quantity comes from, and full control of packaging and inserts. For brands that weigh inventory accuracy heavily, that can justify the labor: every extra count is another place for the number to drift. The real cost of inventory inaccuracy shows up in exactly those gaps.

Which one fits your brand?

Work through four questions about your own operation.

1. Where do your orders come from? FBA fulfills Amazon orders natively, and Multi-Channel Fulfillment can ship orders from your own website out of the same FBA stock. Wholesale orders and store replenishment still need their own route out, and that route decides how much floor you keep.
2. How much prep does your product need? In the US, all FBA prep now happens before the shipment leaves. Products that need bagging, bundling or labels put that work on your floor or your 3PL's under FBA, just as they would if you shipped yourself.
3. Do you keep stock for wholesale or stores? Then decide whether your 3PL handles those orders or whether that stock stays with you. If it stays, the question is what goes out of your floor: parcels, cartons to Amazon, pallets to customers, or all three.
4. How many inventory records can you reconcile? Each model you add brings one more count to check. If nobody owns that reconciliation today, adding a second location will surface the problem before it solves anything.

The answer does not have to be the same for every product. The guide to managing FBA and FBM from one dashboard covers how to split products between Amazon and your own warehouse and keep both as separate stock pools under one item master.

A practical starting point

If you are deciding now, write down, step by step, who does each line of the table for each model you are considering. Then mark which steps your team will still do. The decision gets easier once the work you keep is listed next to the fees you pay and the counts each model adds.