Amazon Seller Shipping Guide: FBA, FBM and Labels

Amazon sellers ship orders in one of three ways: Fulfillment by Amazon (FBA), where Amazon stores, packs and ships your inventory; Fulfillment by Merchant (FBM), where you ship each order yourself with a carrier such as USPS or UPS; or Seller Fulfilled Prime, where you ship yourself but must meet Prime delivery speeds. The right model depends on your product size, sales volume and how much control you want over packaging and shipping costs.

This guide covers how each Amazon fulfillment model works, what changed for FBA sellers in 2026, which USPS and UPS services fit self-fulfilled orders, and where to find our detailed guides on Amazon delivery, returns and customer service. Amazon is one of several selling channels covered in our overview of e-commerce platforms and shipping integration.

How Does Shipping Work for Amazon Sellers?

Every Amazon offer is either fulfilled by Amazon or fulfilled by the seller. With FBA, you send inventory to Amazon fulfillment centers through the Send to Amazon workflow, and Amazon picks, packs, ships, answers customer service questions and processes returns for those orders. FBA listings are also eligible for Prime delivery, which Amazon says can help conversions.

With FBM, the order shows up in Seller Central and you buy a label, pack the item and hand it to the carrier. You keep control over packaging, inserts and carrier choice, and you avoid storing inventory in Amazon’s network. Seller Fulfilled Prime sits between the two: you ship from your own warehouse, but you must pass a trial period and keep meeting Amazon’s late-shipment, valid-tracking and cancellation requirements to keep the Prime badge.

Many sellers mix models: they send best sellers to FBA and keep bulky or seasonal items in FBM. Amazon is also only one channel; sellers who list the same inventory on Poshmark, Depop or their own BigCommerce store often ship those orders from the same shelves with the same carrier accounts.

What Changed for Amazon FBA Sellers in 2026?

The biggest change is that Amazon stopped offering FBA prep and item-labeling services in the United States on January 1, 2026. Amazon used to bag, bubble-wrap or apply FNSKU barcodes for sellers who sent unprepared units. Now sellers must prep and label inventory themselves or use a third-party prep center before units reach a fulfillment center.

In practice, that means every inbound unit needs the right barcode, every poly bag needs a suffocation warning where required, and fragile or sharp items still have to arrive packaged to Amazon’s prep standards. Our guide to Amazon FBA prep and shipping, including partnered carrier versus discounted labels, walks through the requirements and the inbound shipping choices.

How Do You Ship Inventory to an Amazon Fulfillment Center?

You create an inbound shipment in Send to Amazon, tell Amazon what is in each box, print the box labels Amazon generates and then choose how the boxes travel. Small parcel shipments can go through Amazon’s partnered carrier program or on a label you buy yourself, and full pallets move as less-than-truckload (LTL) freight.

1. Prep and label each unit. Apply the FNSKU or manufacturer barcode Amazon assigns and bag or wrap items that need it.
2. Pack cartons within Amazon’s limits. Amazon caps box weight and dimensions for standard-size inventory; our guide to Amazon box sizes and standard FBA dimensions lists common carton sizes that stay inside them.
3. Enter box contents. Amazon needs to know which units are in which carton before it accepts the shipment.
4. Choose the carrier. Compare the partnered carrier quote with your own USPS or UPS rate, or with an LTL quote when you are shipping pallets.
5. Print the carton labels and ship. Each box gets its own Amazon shipment label plus the carrier label.

For pallet loads, compare LTL carriers in the PalletPath freight quote tool before you book, because inbound freight to a fulfillment center is a fixed cost on every unit you sell.

Which Carriers Should Amazon FBM Sellers Use?

Most self-fulfilled Amazon orders go out with USPS or UPS, and the best service depends on package weight and the delivery promise on your listing. Light, small items usually ship cheapest with USPS Ground Advantage, while heavier boxes often price better with UPS Ground.

USPS Ground Advantage and Priority Mail include USPS Tracking and up to $100 of insurance on most shipments, which helps Amazon’s valid tracking requirement. Whichever carrier you use, the tracking number must be uploaded to the order so Amazon can show the buyer where the package is. To see what each option costs for your box, compare live UPS and USPS rates in the ParcelPath rate calculator.

How Do Amazon Delivery Speeds Affect Sellers?

Amazon buyers expect fast, predictable delivery, so the shipping template on an FBM listing has a direct effect on conversion and on your account metrics. Amazon tracks late shipment rate, valid tracking rate and cancellations for self-fulfilled orders, and repeated misses can cost you the Buy Box or Seller Fulfilled Prime eligibility.

It helps to understand what buyers see on their side. Our guide to how long Amazon takes to deliver explains the standard, Prime and same-day windows, and buyers can change the shipping speed on an Amazon order before it ships. Some packages beat their estimate, which is covered in whether Amazon packages can arrive early, and a few remote or restricted addresses fall outside Amazon’s network entirely, as described in where Amazon does not deliver.

How Can Amazon Sellers Cut Shipping Costs?

For FBM orders and inbound FBA parcels, the label is usually the largest variable cost after the product itself. Matching the service to the package matters most: Ground Advantage for light items, cubic pricing for small dense boxes, and UPS Ground for heavier cartons going to business addresses.

ParcelPath gives Amazon sellers discounted labels with up to 85% off UPS and up to 89% off USPS retail rates. It is 100% free, with no subscription, no per-label fee, no minimums and no contract, and more than 44,000 customers use it. You can schedule free USPS pickups, skip the printer with UPS Mobile Barcode at The UPS Store or USPS Label Broker at the Post Office, and add Shipsurance coverage for high-value orders. For pallets, PalletPath provides discounted LTL freight from the same account.

Where Can Amazon Buyers Get Help With Deliveries and Returns?

Most buyer problems fall into a few groups: late packages, missing items and returns. If tracking stalls, start with our guide to an Amazon package delayed in transit. If the box arrived but something is missing, follow the steps in Amazon order missing items.

Return windows, refund timing by payment method and the A-to-z Guarantee are covered in Amazon returns and refunds. When you need to reach a person, our page on Amazon customer service and contacts lists the phone, chat and help center routes.

Frequently Asked Questions

What is the difference between Amazon FBA and FBM?

With Amazon FBA, you send inventory to Amazon’s fulfillment centers and Amazon picks, packs, ships and handles returns and customer service for those orders, and the listings carry the Prime badge. With FBM, you store the inventory and ship each order yourself with a carrier such as USPS or UPS, which gives you control over packaging and carrier choice but makes you responsible for on-time shipping and tracking.

Does Amazon still prep and label FBA inventory?

No. Amazon ended its FBA prep and item-labeling services in the United States on January 1, 2026. Sellers must now apply the required barcodes and do any bagging, wrapping or other prep themselves, or pay a third-party prep center, before the inventory arrives at an Amazon fulfillment center. Units that arrive without the required prep can be refused or delayed.

Which carrier is best for Amazon FBM orders?

For light packages, USPS Ground Advantage is usually the lowest-cost tracked option, with delivery in 2–5 days and packages up to 70 lbs. For heavier boxes, UPS Ground often prices better and accepts packages up to 150 lbs. Whatever you choose, upload the tracking number to the Amazon order so it counts toward your valid tracking rate.

Can I use my own shipping labels for Amazon orders?

Yes. FBM sellers can buy USPS or UPS labels outside Amazon and then confirm shipment in Seller Central with the carrier name and tracking number. The order only counts as shipped once valid tracking is uploaded, so add it on the day the package leaves. You can also buy your own labels for small parcel shipments into FBA.

Sources

• Amazon, Fulfillment by Amazon overview (sell.amazon.com/fulfillment-by-amazon)
• Amazon, Seller Fulfilled Prime program page (sell.amazon.com/programs/seller-fulfilled-prime)
• Amazon Seller Central forums, notice on the end of FBA prep and item-labeling services in the US, effective January 1, 2026
• USPS Ground Advantage
• USPS Priority Mail
• USPS Priority Mail Express
• UPS Ground