Dani Mechlowitz
Co-Founder of Delta Fulfillment
A carrier account manager once offered a sharper rate on the condition that more volume moved their way. It was an easy conversation to say yes to. It was a much harder one to unwind two years later, when a client needed a delivery option that carrier didn't do well, and untangling the relationship meant putting the rate at risk.
Most 3PLs I know have had a version of that conversation. It's how the industry is set up: carriers reward volume, so the instinct is to consolidate around whichever one or two can do the most of it, negotiate hard, and build the operation on that foundation. On paper it looks like the sensible move. In practice, it's a trade a lot of 3PLs make without quite realizing what they're trading away.
The Dilemma at the Center of Every Carrier Decision
Volume is supposed to be a 3PL's biggest advantage. Enough parcels through one account and a carrier will talk seriously about rate. So most carrier strategy starts and ends with the same question: which one or two carriers can we push the most volume through, for the best number.
The trouble is a rate card is a snapshot, not a strategy. It tells you what a carrier will charge this quarter, for the mix of shipments you're sending them today. It says nothing about the client you sign next month whose customers expect next-day delivery somewhere that carrier is average at. It says nothing about what happens to your rate the day a client leaves and takes their share of the volume with them.
Why Concentrating Volume Isn't the Safety Net It Looks Like
Rate is the easiest thing to negotiate, and it's also the easiest thing to lose. Committing volume to a carrier in exchange for a number ties a 3PL's cost base to that carrier's performance, capacity and pricing decisions, none of which the 3PL controls. When a carrier has a bad peak, changes its surcharge structure, or simply stops being competitive on a lane it used to handle well, a 3PL with two carrier relationships has somewhere else to send the work. A 3PL with one doesn't.
There's a second cost that surfaces later and is harder to trace back to the original decision: reduced leverage everywhere else. Once a large share of volume sits with one carrier, that relationship becomes something to protect rather than something to optimize. Moving shipments elsewhere, even shipments that carrier was never well suited to, feels like it risks the rate on everything else. So the 3PL keeps sending them work that would ship better somewhere else, because the alternative feels riskier than it is.
What This Does to the Brands a 3PL Serves
This is the part that gets lost in conversations about rate cards, and it's the part that matters most. A 3PL's carrier mix isn't only an internal cost decision. It's the raw material the 3PL uses to build its own proposition to the brands it ships for.
Different brands need genuinely different things from a carrier network. A homeware brand shipping bulky, lower-value parcels domestically has a different profile to a fashion brand shipping internationally on a tight returns promise. A brand expanding fast into a new region needs a 3PL that can flex into a carrier relationship that actually works there, not one whose network was built around where the business used to sell. A restricted carrier portfolio doesn't just cap a 3PL's own margin. It caps which brands the 3PL can serve well, and how honestly it can answer "can you handle this for us" when a prospective client asks.
That's the chain worth sitting with: carrier flexibility decides how much flexibility a 3PL can offer, which decides what it can credibly promise a brand, which decides what that brand's own customers actually experience at the door. None of those links are abstract. They show up as a missed delivery window, a return that costs more than it should, or a brand that quietly moves its account somewhere more adaptable at renewal.
Competitive Rates & Flexibility Were Never Really in Conflict
The instinct to concentrate volume comes from a real constraint: carriers reward volume, and most individual 3PLs don't have enough of it with any single carrier to negotiate well alone. But that's a volume problem, not a carrier-count problem, and the two get treated as the same thing far too often.
A multi-carrier model built on pooled volume, where a 3PL's shipments sit alongside other businesses' shipments across the same carrier relationships, breaks that link. The 3PL isn't negotiating alone any more, so it stops having to choose between rate and choice. It can offer a client whichever carrier actually suits their shipment, their destination and their customer promise, without every one of those decisions threatening its own cost base. Rate stability stops depending on any single client's growth or churn, because it's built on volume the 3PL never had to accumulate by itself.
That's a different kind of leverage to the one most 3PLs are chasing. It doesn't require being the biggest shipper in the room. It comes from being connected to volume beyond what any single 3PL could build alone.
Why This Matters More, Not Less, as a 3PL Scales
The dilemma doesn't ease off as a 3PL grows. It compounds. More clients bring more shipment profiles and more destinations to cover, with more service promises riding on getting each one right. A 3PL running five clients can probably get away with a narrow carrier set, because the odds are decent that most of those clients fit what one or two carriers do well. A 3PL running 50 can't, because those odds drop close to zero.
Operational resilience turns into a genuine commercial requirement at that stage, not a nice-to-have. A carrier having a bad week during peak, or quietly pulling back capacity on a lane, needs to be an operational inconvenience rather than a client-facing crisis. That only holds if there's somewhere else for the volume to go that doesn't come at the cost of the rate the 3PL's margin depends on.
Where a Multi-Carrier Partner Actually Earns Its Place
This is where working with a multi-carrier partner changes the shape of the problem, rather than just adding another vendor to manage. It's the model ITD Global runs for 3PLs across the UK: pooled volume across the whole book of business unlocks rates that would normally take a single client's own scale to negotiate, spread across a network that includes Royal Mail, DPD, Evri, DHL, FedEx, UPS and Parcelforce. The value isn't a longer list of carrier logos to point to. It's the mechanics underneath: rates that hold steady independent of any one client's ups and downs, genuine choice across carriers for a given shipment rather than a default, label generation and daily collections that plug straight into a 3PL's existing WMS, and billing that runs through one system so each client's costs stay clean and reconcilable instead of adding administrative weight on top of the flexibility.
For 3PLs specifically, that network covers domestic and international parcels, freight for bulkier consignments, and returns handling, so growth into a new sector or a new market doesn't mean sourcing and managing another carrier relationship from a standing start.
Done properly, this sits on top of how a 3PL already runs its warehouse and its client accounts, rather than replacing any of it. The goal isn't more carrier options for their own sake. It's a 3PL being able to say yes to a wider range of clients and shipment profiles, and mean it, without every yes quietly narrowing what it can offer the next client who asks.
The obvious pushback is that this just swaps one dependency for another, a carrier's leverage for a partner's. It's a fair challenge. The answer is that a multi-carrier partner isn't meant to replace a 3PL's own direct carrier accounts, only to sit alongside them. The point isn't fewer relationships to manage. It's more options on the table for any given shipment, with none of them able to hold the 3PL's whole rate structure hostage.
I've watched this play out at Delta Fulfilment from the inside, and the shift isn't dramatic day to day. It shows up in fewer conversations about turning down business a carrier mix can't support, and more in how quickly a new client can get shipping.
The Question Worth Asking Instead
Most conversations about carriers start and end with rate. It's the easiest thing to compare, so it gets treated as the whole decision. But for a 3PL, rate is an input into a bigger question, not the answer to it.
The better question isn't which carrier gives the best rate. It's how to build a carrier strategy that gives a 3PL, and the brands it serves, the flexibility to keep succeeding as both grow. Volume should be what buys that flexibility. It shouldn't be what gets traded away for it.
Want to see what a multi-carrier setup could look like for your 3PL? ITD Global gives 3PLs access to multi-carrier rates built on pooled volume, with no volume commitments, separate rules and billing for each client, and a connection to your existing WMS. Talk to the ITD Global team.
About the author: Dani Mechlowitz is Co-Founder of Delta Fulfilment and CRO at ITD Global, a UK multi-carrier shipping platform.
