What is a 3PL (and a 4PL): definitions, services, costs and how to choose
The terms 1PL, 2PL, 3PL and 4PL explained without jargon, what a logistics provider really includes, when it makes sense to hire one and which questions to ask before you sign.
Updated 27 October 2026 · 5 min read
“PL” stands for party logistics: who takes care of logistics in the chain between the business that makes or sells a product and the person who buys it. The number tells you how many parties are involved and how much is delegated. Understanding it helps you know what you are hiring and, above all, what you are not.
From 1PL to 4PL: the definitions
| Model | Who handles logistics | Example |
|---|---|---|
| 1PL | The company itself, with its own resources | A brand that stores stock on its own premises and takes orders to the parcel office |
| 2PL | A provider that handles one specific part, usually transport | A parcel carrier or a shipping line |
| 3PL | A provider that takes on several physical operations: storage, order picking, shipping, returns | An external warehouse that receives your stock and picks and packs your orders |
| 4PL | An integrator that designs and coordinates the whole chain, often subcontracting several 3PLs and carriers | A consultancy or platform that manages logistics providers in several countries |
People sometimes also talk about 5PL for networks that aggregate capacity from many providers. In practice, the boundary between categories is blurred: many 3PLs provide software and some coordination, and some 4PLs have their own warehouse. The useful thing is to ask what each party does with its own hands and what it subcontracts.
What a 3PL includes
A third-party logistics provider takes care of the physical operation and the information that goes with it. The usual services are:
- Receiving goods: unloading, counting, quality control and put-away.
- Storage by pallet, shelf slot or volume.
- Order picking (pick & pack): picking the units, packing them and labelling them.
- Dispatch with one or more carriers, either the provider’s or the client’s.
- Returns (reverse logistics): receiving, inspection and restocking.
- Value-added services: kitting, labelling, personalisation, stock counts.
- Software: integration with your online shop or ERP and a portal to see stock, orders and invoices.
When the service focuses on online shop orders it is usually called ecommerce fulfillment; when it serves retailers and distributors, B2B logistics. A good 3PL does both from the same stock.
How a 3PL charges
Few providers publish their full rates, and the price varies a great deal depending on the product, the volume and the returns. What is common is the structure: almost all of them charge by line items that you can compare one by one.
| Charge | How it is usually measured |
|---|---|
| Receiving | Per pallet, carton or unit counted on arrival |
| Storage | Per pallet, slot or cubic metre occupied; better based on the daily average than on a snapshot at month end |
| Picking | Per order (first item) plus an amount for each additional unit |
| Packaging | Per order or per type of box |
| Returns | Per unit received, inspected and put back in stock |
| Bespoke services | Per hour or per unit (kits, labelling, stock counts on request) |
| General terms | Monthly minimum, set-up fee, software fee, surcharges |
Transport is usually charged separately. Your cost will depend mainly on product size, units per order and your return rate. To make sense of a real invoice, see how to read a fulfillment invoice.
When hiring a 3PL makes sense
Outsourcing makes sense when the total cost of doing it yourself (staff, space, materials, errors, team time) exceeds the provider’s rate, or when logistics is holding back growth. Common signs:
- Campaign peaks cannot be covered without delays.
- You are running out of space and expanding means a long-term lease.
- Picking errors lead to returns and negative reviews.
- You are opening new channels (marketplaces, retailers) with requirements you do not know how to meet.
- The founding team spends more time packing than selling.
A 4PL makes sense at a different scale: when you already work with several warehouses or countries and need someone to coordinate and optimise the whole network. For most small and medium-sized brands, the real decision is between doing it in-house or with a 3PL.
How to choose a 3PL
Specialisation
Storing cosmetics is not the same as storing motorcycle helmets or clothing in twenty sizes. Ask about clients with a product similar to yours and how they handle its particular features: sizes, bulky items, batteries, exchanges.
Visibility and software
According to 2025-2026 industry indices, 69% of brands require real-time visibility of their stock. Ask for a demo of the portal: stock by SKU and status, orders, returns and reports. Also check which integrations it has with your online shop and your carrier.
Rate transparency
Ask for the full rate card in writing, with a sample invoice. Ask specifically about minimums, seasonal surcharges, long-term storage and returns: in the United States, for example, 92% of warehouses charge for returns and almost half (48.6%) apply long-term storage surcharges (The Fulfillment Advisor, 2025).
What to ask before you sign
- What do you do yourselves and what do you subcontract?
- How is storage invoiced: a snapshot at month end or the daily average?
- Is there a monthly minimum, a set-up fee or a software fee?
- Can I use my own carrier account?
- How can I see stock, orders and returns in real time?
- What liability do you accept for loss or damage, and with what insurance?
- What does the exit process look like if I decide to change provider?
At ZENVU we are a 3PL with our warehouse in Álava, Spain, and our own software: ZENVU Portal to see stock, orders, returns and an invoice explained charge by charge; ZENVU WMS to guide order picking; and ZENVU Connect to integrate with Shopify, WooCommerce, Sendcloud (with your account) or via API. To find out your rate, fill in your details for an offer.