--- title: "What Is a 3PL (Third-Party Logistics)?" url: https://www.uncap.com/glossary/3pl author: "Denis Dyli" published: 2026-10-14 updated: 2026-10-14 summary: "A 3PL (third-party logistics provider) is an outside company that runs logistics work a business used to do in-house: warehousing, transportation and related services. It stores, handles and ships goods on the seller's behalf, but it does not take ownership of them. The goods stay the seller's property while the 3PL holds them." --- # What Is a 3PL (Third-Party Logistics)? > A 3PL (third-party logistics provider) is an outside company that runs logistics work a business used to do in-house: warehousing, transportation and related services. It stores, handles and ships goods on the seller's behalf, but it does not take ownership of them. The goods stay the seller's property while the 3PL holds them. **3PL (third-party logistics)**: A 3PL (third-party logistics provider) is an outside company that runs logistics work a business used to do in-house: warehousing, transportation and related services. It stores, handles and ships goods on the seller's behalf, but it does not take ownership of them. The goods stay the seller's property while the 3PL holds them. ## How it works The Federal Highway Administration's freight glossary describes a 3PL as a logistics specialist that may provide transportation, warehousing and logistics-related services to buyers or sellers, tasks the customer previously performed in-house. Two US federal definitions, each written for its own product area, draw the ownership line. The drug supply chain definitions in 21 U.S.C. 360eee, part of the pharmaceutical distribution supply chain rules, describe a third-party logistics provider as an entity that provides or coordinates warehousing or other logistics services on behalf of a manufacturer, wholesale distributor or dispenser, but does not take ownership of the product, nor have responsibility to direct its sale. The Consumer Product Safety Act (15 U.S.C. 2052) defines one as a person who solely receives, holds or otherwise transports a consumer product but does not take title to it. Partners that work over EDI can use two X12 documents for this exchange. The 940 Warehouse Shipping Order lets the depositor advise a warehouse to make a shipment, or modify or cancel a previously sent order. The 945 Warehouse Shipping Advice comes back from the warehouse to say the shipment was made, and it is used to reconcile order quantities with shipment quantities. ## On Shopify On Shopify, an outside warehouse that connects through an app works as a fulfillment service. Shopify's developer docs describe fulfillment service apps as providing third-party warehousing, print on demand, or fulfillment services that prepare and ship orders on behalf of merchants. Each fulfillment service has its own location, which Shopify creates automatically when the service is set up. You select a fulfillment method for each product, so a single order can use different fulfillment methods for different items: the fulfillment service ships some items and you ship the rest. **How an order reaches a 3PL on Shopify** ### 1. Request, Fulfillment request You request fulfillment, or automatic fulfillment requests it when the order is paid, and the service is asked to pick, pack and ship. ### 2. Accept, Accept or decline The fulfillment service accepts or declines the request, and the outcome is noted in the order timeline. ### 3. Ship, Fulfillment and tracking The service ships the order, and any tracking information it provides is added to the order automatically. ### 4. Done, Fulfilled status The order displays a Fulfilled status only after all of its items are shipped. ## Common problems Shopify's help pages flag three traps: - Late changes. After you request a fulfillment, you can no longer edit the order or refund items. A request that has not been accepted yet can be canceled from the admin; an accepted one needs a cancellation request that the service can accept or reject. - Reverting is not canceling. Reverting an order to unfulfilled doesn't stop the service from fulfilling it. Unless the service confirms the cancellation, the order might ship and you will be charged for the product and the fulfillment. - Shipping it yourself. Mark as fulfilled isn't available on orders assigned to a fulfillment service location. Change the order location to one you manage first. ## Example A distributor keeps its fast-moving gloves at a 3PL and ships heavy equipment from its own warehouse. A buyer orders 40 cases of gloves and 10 cases of equipment, 50 cases in all. Because fulfillment is set per product, the order splits in two. The distributor requests fulfillment for the 40 glove cases, the 3PL accepts and ships them, and the tracking it provides is added to the order. The team ships the 10 equipment cases from its own location. The order shows Fulfilled only when both shipments have left. If the buyer adds 5 glove cases after the request is sent, the order can no longer be edited, so in practice they go on a new order. ## How Uncap helps Uncap's guide to [running wholesale and retail from one Shopify store](/post/shopify-wholesale-retail) shows how Shopify Flow can route orders by channel: a large wholesale order might trigger a fulfillment approval step, while a DTC order might route directly to your 3PL. If you hold inventory for committed wholesale orders, the guide says that allocation logic needs to exist outside Shopify's native layer: in a 3PL integration, a warehouse management system, or Flow rules that flag large wholesale orders for inventory review before fulfillment. ## Related terms - Warehouse management system (WMS) - EDI 940 (Warehouse Shipping Order) - EDI 945 (Warehouse Shipping Advice) - Order management system - LTL freight - Backorder ## Sources - FHWA Freight Glossary and Acronyms - 21 U.S. Code ยง 360eee, Definitions (Cornell LII) - Shopify Help Center: Fulfilling orders using a fulfillment service with an app ## Frequently asked questions ### What does a 3PL mean? 3PL stands for third-party logistics: an outside specialist that provides transportation, warehousing and logistics-related services a business previously handled in-house. It works on the seller's behalf and does not take ownership of the goods. ### What is a 3PL warehouse? It is a warehouse run by a third-party logistics provider, which stocks goods for other businesses and ships orders on their behalf. On Shopify, a fulfillment service connected through an app has its own dedicated location, which Shopify creates automatically.