3PL & Third-Party Logistics
What Is a 3PL? Third-Party Logistics, Explained
UPDATED JUNE 8, 2026 · BY SUPPLIER WAREHOUSE
Third-party logistics — 3PL — is one of the most-used and least-explained terms in the supply chain. Here’s the plain version.
A 3PL is a company you hire to handle warehousing, fulfillment, and distribution for you. You own the inventory; they provide the building, the people, the equipment, and the processes that store and move it.
If you make or import products and need somewhere to store, handle, and ship them — without buying a warehouse and hiring a team — a 3PL is how you do it.
What a 3PL actually does
Most 3PLs offer some combination of:
- Warehousing & storage — pallet, bulk, or dedicated space for your inventory
- Receiving & handling — unloading, inspecting, and putting away inbound freight
- Fulfillment — picking, packing, and shipping orders
- Distribution & cross-docking — moving freight to regional markets, often without long-term storage
- Transloading — switching freight between rail, ocean, and truck
- Value-added services (VAS) — kitting, repackaging, labeling, and light/sub-assembly
The best fit depends on what you move and how fast it turns. A high-velocity importer needs cross-dock and transload; a manufacturer feeding an assembly line needs sequencing and subassembly; a seasonal brand needs flexible overflow.
How 3PL pricing works
3PL cost isn’t one number — it’s a stack:
- Storage — per pallet or per square foot, per month
- Receiving / inbound handling — per unit, per pallet, or per hour
- Outbound handling — pick, pack, and ship
- Value-added services — priced per task (kitting, labeling, assembly)
- Accessorials — anything outside the standard scope
Because the mix varies so much, the fastest way to a real number is to model your volume, then compare quotes. Estimate your monthly cost →
3PL vs 4PL
A 3PL executes — it runs the warehouse and moves the freight. A 4PL manages — it orchestrates several 3PLs and carriers as a single point of control, usually owning no assets. Most growing B2B companies don’t need a full 4PL relationship; they need help finding the right 3PL — which is exactly what a free sourcing partner does.
When a 3PL makes sense
Use a 3PL when you want to skip the capex and fixed labor of owning a building, when volume is seasonal or uncertain, when you’re entering a new region, or when you need a specialized capability — cold storage, foreign-trade-zone, automotive sequencing — faster than you could stand it up yourself.
Keep it in-house only when warehousing is genuinely a core competency and your volumes are large and stable enough to justify the asset.
Sourcing a 3PL? We find and compare vetted providers across our network — free to you. Get matched →
What does a 3PL company do?
A third-party logistics (3PL) provider handles outsourced supply-chain functions on your behalf — most commonly warehousing, inventory management, order fulfillment, distribution, cross-docking, and value-added services like kitting and assembly. You own the goods; the 3PL operates the space, labor, and processes that move them.
How much does a 3PL cost per month?
3PL pricing is built from a few components: storage (per pallet or per square foot, per month), receiving/handling (per unit or per hour inbound), pick-pack or outbound handling, and value-added services. Most B2B contract-warehousing programs price storage in the $12–$25 per pallet per month range plus activity-based handling — but it varies widely by market, volume, and service mix. Use a cost estimate as a starting point, then get matched to real quotes.
What is the difference between a 3PL and a 4PL?
A 3PL executes logistics functions (it runs the warehouse, moves the freight). A 4PL manages logistics — it orchestrates multiple 3PLs and carriers on your behalf as a single point of control, but typically owns no assets itself. A sourcing partner like Supplier Warehouse helps you find and compare 3PLs without the long-term lock-in of a 4PL contract.
When should I use a 3PL instead of my own warehouse?
Outsource to a 3PL when you want to avoid capex and fixed labor, when volumes are seasonal or uncertain, when you're entering a new region, or when you need specialized capabilities (cold storage, FTZ, sequencing) faster than you could build them. Keep it in-house when warehousing is a core competency and volumes are large and stable enough to justify owning the asset.