What Is 3PL? How Distributors Evaluate Third-Party Logistics Partners

A third-party logistics provider sells you someone else's building, labor, and often their carrier contracts. Scope ranges from overflow pallets in a public warehouse to a dedicated room with your WMS on their floor. You are buying variable cost and someone else's hiring problem. You are selling some of your cutoff, your culture, and your ability to walk the aisle at 6 a.m.

4PL and 'control tower' pitches show up once you are mid-market. Ignore the number in the acronym until you can name the SKUs, the cutoff, and the claims process. If they cannot show you a building that already ships your kind of mix — cases, inners, lot codes — you are a science project.

Price the handoff. Onboarding fees, WMS mapping, label compliance, and the first 60 days of your buyer's time are real costs. A cheap per-order rate with a $18,000 implementation and a 90-day learning curve is not cheap.

Seasonal peaks, a distant city with 40 doors, and a category you are testing all favor a 3PL. You convert rent and a supervisor into a pick fee. You can leave. That option value is worth more than a 40 bps rate difference if the lane might die.

Worked overflow. Dallas doors do $90,000 a month for four months and $25,000 the rest of the year. A small lease plus two people is $18,000 a month all-in. A 3PL at $8.50 a order plus $12 a pallet/month storage is about $7,000 in the quiet months and $11,000 in the peak. You keep the difference and you do not own a second alarm system. That is a good 3PL year.

It stays good until the 3PL's peak surcharge hits, storage minimums apply to pallets you did not sell, and they miss your 1 p.m. cutoff because a bigger tenant ate the labor. Write those three events into the contract conversation before you ship the first pallet.

Short cutoffs, customer-specific labels, lot/FEFO, serials, or a will-call counter your independents use on the way home — those are in-house jobs unless you found a specialist who already does them for a competitor (and will show you). A generalist e-commerce 3PL will pick your 22-line B2B order like a Shopify kit and you will eat the chargebacks.

If the buyer can walk into your dock and leave with a case, a 3PL two states away is not a substitute. If the brand requires a quarantine cage and a documented destruction, ask to see the cage. If they smile, keep looking.

OSHA still applies in their building, but it is their program. Your product liability and your banner's audit may still ask for their certificates. Collect COIs, food-grade letters, and SOC-ish security stories before you move lot-controlled inventory, not after the first recall drill.

Define accuracy, on-time ship, dock-to-stock, and inventory integrity with a measurement method and a credit. 'We'll do our best' is not a remedy. Cap storage rate increases. Cap peak surcharges or at least calendar them. Require a 90-day exit with a pick-and-pack-out price so you are not hostage.

Claims: who files, who pays the deductible, how damaged returns move. If the 3PL's carrier punches a pallet and the banner charges you $400, you need a path that is not 'open a ticket.' Name the path.

Data: you own the item master, the order history, and the inventory snapshot. Daily files. If they hold data at exit, you will relive implementation. Put the file spec in the exhibit.

Retailer portal fines for late appointments, bad ASNs, and label errors will land on your remittance. The 3PL will say the ASN failed because your item master was wrong. You will say their clerk missed the batch. Whoever has the cleaner exhibit wins. Write the split: their pick/label/ship errors are their money; your master-data errors are yours.

RMA processing is a common gap. If they store your returns as 'problem pallet' for three weeks, you will miss the vendor return window. SLA the disposition clock — 48 or 72 hours — and a weekly aging file.

Insurance: warehouse legal liability is often $0.10–$0.25/lb and will not replace a stolen high-value aisle at sell price. Buy your own stock throughput or difference-in-conditions if the category is worth stealing. Read the limit before you store $2 million in one room.

The quiet-month math held. In October the 3PL's bigger tenant launched a toy season, labor walked, and your 1 p.m. cutoff became 4:30. You expedited $6,800 of freight in three weeks and ate two banner chargebacks. The annual savings shrank by half. You stayed because the lease market was worse — but you added a contractual peak labor minimum and a right to pull A items home on 14 days' notice.

That right to pull is the clause founders skip. Without it, a bad peak becomes a year.

Visit twice a year unannounced if you can. Walk the locations, count ten A items, watch a wave. A polished QBR slide deck is not a cycle count.

Price the outbound: per pallet pick-out, labeling, and the last month's storage. Time it. If they can hold you 120 days because 'labor,' you do not have an exit. You have a hope.

Keep a parallel ability to ship A items from home for 60 days after go-live. Dual-running is ugly and cheaper than a failed cutover. Kill the dual-run on a date with a fill-rate gate, not a vibe.

FMCSA does not care that your 3PL 'handles freight.' If you tender interstate shipments in your name, know whether you need authority or whether you are a shipper using their broker MC. The banner that asks for your MC number will not accept a shrug.

If the 3PL cannot send you a nightly inventory snapshot and an 856 that your ERP will swallow, you will sell air. Test the files on a dummy item before the first live PO. Include UOM conversions — they will receive cases and you will sell inners, or the reverse, and the first week will be a recount.

Customer-specific labels and GS1-128 are where generalist 3PLs fail. Send five live samples of the hardest label, not the easiest. Watch them print. If they 'will get to that after go-live,' there is no go-live.

Access to their WMS as a read-only user is worth more than a weekly PDF. You need to see locations and holds on a Tuesday at 9 a.m. when a banner is screaming. A QBR slide in week six is not visibility.

Ask for: inbound receive per pallet and per line, storage per pallet/month and a 30-day minimum, pick per order and per line, pack materials, outbound accessorials, returns intake, cycle-count fees, IT, and peak surcharge. A blended 'about $9 an order' will not survive a 22-line wholesale order. Price your actual mix: median lines, median weight, percent of orders with a custom label.

Worked compare. In-house: $11,200 rent, $9,800 two people, $1,400 utilities/insurance share = $22,400/month at 2,400 orders → $9.33/order before occupancy of shared space. 3PL quote $6.80 + $1.10/line on a 9-line median = $16.70 plus storage $4,800. You are not saving money; you are buying flexibility. That can still be correct. It is not a $6.80 story.

Inflation clauses tied to CPI or labor indexes are fine if they are capped and noticed. Open-ended 'market adjustment' is a second negotiation every June. Cap it or walk.