What Is a Third Party Logistics Company?
What a 3PL actually does, how it differs from a 4PL, and how to work out whether you need one.
A third party logistics company, commonly shortened to 3PL, is a service provider that manages warehousing, transportation, inventory control and distribution on behalf of another business. Instead of running these functions internally, a company contracts a 3PL to store its goods, fulfil its orders and arrange its freight.
The model exists because logistics infrastructure is expensive and lumpy. A warehouse, a fleet, a warehouse management system and the staff to run them represent significant fixed cost, and most businesses do not have enough volume to use them efficiently year-round. A 3PL spreads that cost across many clients.
The term is well established rather than a marketing label. The Council of Supply Chain Management Professionals lists the management of third-party logistics providers among the standard activities of logistics management, alongside transportation, warehousing and order fulfilment.
A note on who we are: Infinity IPS is not a 3PL. We provide back office support — billing, inventory reconciliation, chargeback management and documentation — to 3PL providers and other logistics companies. This guide is written for anyone trying to understand the model, whether you are considering using a 3PL or working out how one operates.
One
What services a 3PL provides.
Not every 3PL offers all of these, and the mix varies considerably by provider. Some specialise in warehousing, others in transportation, others in e-commerce fulfilment specifically.
- Warehousing and inventory management
- Order fulfilment — picking, packing and shipping
- Transportation and freight coordination
- Returns handling and reverse logistics
- Packaging, labelling and kitting
- Cross-docking and transloading
The value is access rather than the individual services. A business using a 3PL gets established infrastructure, trained staff and logistics technology without the capital required to build any of it.
Two
How a 3PL actually works.
In practice the relationship runs across four functions, and understanding them makes the pricing structure easier to read.
Inventory control
Stock levels monitored against reorder points, with warehouse management systems tracking what is where. Prevents both stockouts and the cost of overstocking.
Order fulfilment
Orders picked, packed and shipped, usually across several carriers so that each shipment goes by whichever is most appropriate for its destination and urgency.
Transportation
Freight contracts negotiated, routes planned, documentation handled. A 3PL's combined volume usually secures better carrier rates than an individual business could.
Reporting
Performance data on shipping cost, delivery times and inventory turnover — the visibility that replaces watching your own warehouse floor.
Three
3PL versus 4PL.
The distinction is about who holds strategic control, and it comes up often enough to be worth understanding properly.
Third party logistics (3PL)
Executes the work — storage, fulfilment, transportation — while the client keeps strategic control and manages the relationship directly.
Fourth party logistics (4PL)
Oversees the whole supply chain and manages multiple 3PL providers on the client's behalf, acting as a single coordinating layer above them.
Most businesses start with a 3PL and only consider 4PL when their network becomes complex enough that managing several providers is itself a full-time job. Going straight to 4PL with a simple supply chain usually adds a management layer without adding much.
Four
When using a 3PL makes sense — and when it does not.
It usually makes sense when:
- Order volume has outgrown what you can fulfil yourself
- You need distribution in a region where you have no facility
- Seasonal peaks would force you to carry unused capacity year-round
- Warehouse and fleet investment would take capital you would rather spend elsewhere
- You are entering a market where you do not know the carrier landscape
It makes less sense when:
- Volume is low enough that the per-order cost outweighs the fixed cost you would avoid
- Your product requires handling knowledge a general provider will not have
- The customer experience at unboxing is central to your brand
- Your margins cannot absorb a provider's markup on freight
Five
How to evaluate a provider.
In rough order — the first step matters most, because everything after it depends on knowing what you actually need.
- Assess your own requirements. Shipment volumes, product types, handling needs, service expectations. Providers cannot scope accurately against a vague brief.
- Check sector experience. A provider who handles your product category already will have solved problems you have not yet encountered.
- Review technology compatibility. Their WMS has to talk to your e-commerce platform and your ERP. Integration difficulty is a common source of disappointment.
- Confirm geographic coverage. Warehouse locations should match where your customers actually are, not where the provider happens to have space.
- Request references. Speak to current clients of comparable size — not the flagship account.
- Understand the full pricing structure. Storage, handling, pick fees, receiving, returns, minimums. Base rates rarely represent the total.
- Test scalability. Ask what happens at three times your current volume, and at half of it.
Common difficulties worth planning for: reduced direct visibility over fulfilment, integration friction between systems, and service consistency as volume grows. Each is manageable with agreed performance metrics, regular reporting, and documented standard operating procedures written before go-live rather than after.
Already running a 3PL operation?
We handle the back office behind it — client billing, inventory reconciliation, chargeback management and carrier invoice audit.
Common questions
Third party logistics, answered.
What is a third party logistics company?
A third party logistics company, or 3PL, is a service provider that manages warehousing, transportation, inventory control and distribution on behalf of another business. Instead of running these functions internally, a company contracts a 3PL to store its goods, fulfil its orders and arrange its freight.
What services does a 3PL provide?
Warehousing and inventory management, order fulfilment and processing, transportation and freight coordination, returns handling and reverse logistics, packaging and kitting, and cross-docking or transloading. Not every 3PL offers all of these.
What is the difference between 3PL and 4PL?
A 3PL executes logistics tasks — storage, fulfilment, transportation — while the client keeps strategic control. A 4PL oversees the entire supply chain and manages multiple 3PL providers on the client's behalf, acting as a single coordinating layer. Most businesses start with a 3PL and only consider 4PL when their network becomes complex enough to need managing.
When does using a 3PL make sense?
Usually when order volume outgrows your own capacity, when you need distribution in a region where you have no facility, or when seasonal peaks would otherwise force you to carry unused capacity year round. It makes less sense when volume is low or highly specialised.
How do you evaluate a 3PL provider?
Assess your own volumes and product requirements first, then look at sector experience, technology compatibility with your systems, geographic coverage against your target markets, references from current clients, the full pricing structure rather than base rates, and whether they can scale with you.
What are the main risks of using a 3PL?
Reduced direct visibility over fulfilment, integration difficulty between their systems and yours, and inconsistent service quality as volume grows. Each is manageable with agreed performance metrics, regular reporting and documented standard operating procedures.