Getting goods to a US port is not the same as having sellable inventory. Between the container and the customer sits a warehouse, and the choices you make about it determine your delivery speed, your marketplace performance, your return handling and a surprisingly large slice of your unit economics. This guide covers what a 3PL does, how the pricing is built, and what to check before you commit inventory to one.
What a 3PL actually does
A third-party logistics provider stores your inventory and executes fulfilment on your behalf. For an importer selling in the US, the service set usually includes:
- Receiving — accepting the inbound container or truck, unloading, counting, inspecting for damage, and reconciling against your purchase order or ASN.
- Storage — pallet, shelf or bin locations, billed by space and time.
- Pick, pack and ship — order-by-order fulfilment with carrier label generation and rate shopping.
- Prep for marketplace fulfilment networks — labelling, polybagging, bundling, carton building and appointment-based delivery into a marketplace’s own warehouses.
- Returns processing — receiving returned units, inspecting, grading, restocking or disposing.
- Value-added services — kitting, relabelling, repacking, light assembly, quality sorting.
- Systems — an inventory portal and integrations with your sales channels.
The categories matter because they map directly to the fee schedule.
The fee structure, decoded
Almost every 3PL quote is built from the same components, and comparing quotes means normalising them onto your actual order profile.
Receiving. Charged per container, per pallet, per carton or per unit — sometimes by the hour. Floor-loaded containers (cartons stacked loose, no pallets) cost substantially more to unload than palletised freight. If your factory can palletise economically, ask for a quote both ways; the freight cost of the extra volume may be less than the receiving surcharge.
Storage. Per pallet, per bin or per cubic foot, per month or per period. Watch for: minimum monthly charges, long-term storage surcharges, and whether partial periods are prorated. Storage is where slow-moving inventory quietly eats margin.
Pick and pack. Typically a base fee per order plus an incremental fee per additional item. A business selling multi-item orders and a business selling single-item orders have different effective costs from the same rate card.
Packaging materials. Boxes, mailers, void fill, tape, and any custom packaging — sometimes included, more often billed.
Shipping. The carrier cost, usually at the 3PL’s negotiated rates plus a margin or a handling fee. This is frequently the largest line and the least comparable between quotes; ask exactly how it is calculated.
Returns. Per return, sometimes with an inspection or restocking element.
Account minimums and onboarding. Monthly minimums, integration setup, and sometimes a per-SKU setup fee.
To compare providers, build a model order — your real average order: number of items, weight, dimensions, destination mix — and ask every provider to price that exact order plus your real monthly volume and storage footprint. A rate card comparison without your order profile tells you very little.
Location: the decision that is hardest to reverse
Three considerations dominate.
Proximity to your port of entry. Goods arriving at a West Coast port and stored near that port avoid a cross-country move. Southern California is the dominant cluster for Pacific imports for exactly this reason, with a deep bench of 3PLs experienced in Asia-origin freight and a short drayage from the port complex.
Proximity to your customers. Ground parcel transit time and cost are a function of distance. A single warehouse near the port optimises inbound; a single warehouse in the middle of the country optimises average outbound; two warehouses optimise both and multiply overhead. Most importers start with one, near the port, and split only when order volume justifies it.
State-level considerations. Where inventory is stored can affect state tax obligations. This is a question for a qualified accountant, not for a logistics quote.
Marketplace fulfilment: the hybrid model
Many importers use a 3PL alongside a marketplace’s own fulfilment network rather than instead of it. The pattern:
- Container arrives at the 3PL.
- The 3PL receives, inspects, and preps to the marketplace’s requirements — barcode labels, polybags with required warnings, suffocation labelling, bundling, carton labelling and weight limits.
- The 3PL ships planned quantities into the marketplace network on the marketplace’s shipment plan and appointment.
- The remainder stays at the 3PL as reserve stock, and as the fulfilment source for other sales channels.
This model exists because it solves real problems: marketplace long-term storage fees make it expensive to hold a full container inside their network; receiving errors on a full container are painful; and a 3PL buffer lets you replenish in response to actual sales rather than committing everything up front. It also gives you a place to send returns and a way to serve non-marketplace channels.
Prep requirements are exacting and change; the details belong in your QC protocol as well as your 3PL instructions, because a mislabelled carton discovered at the marketplace’s receiving dock is far more expensive than one caught in China — see Pre-shipment QC.
Questions to ask before you commit inventory
Operations
- What is your receiving turnaround from container arrival to sellable inventory, and what happens during peak season?
- Do you handle floor-loaded containers, and at what surcharge?
- What is your order cut-off time for same-day shipping, and what percentage do you actually hit?
- What is your pick accuracy, and how is it measured?
- What do you do when the count does not match the packing list?
- Can you handle inspection or sorting if a lot arrives with a quality problem?
Systems
- Which sales channels do you integrate with natively, and how is inventory synced?
- Can I see real-time inventory, order status and receiving reports myself?
- How do you handle lot or batch tracking, if my product needs it?
Commercial
- What are the account minimums, and what is the notice period to leave?
- Who owns my inventory data, and what does an exit look like operationally?
- How are shipping rates calculated, and can I use my own carrier account?
- What is your insurance position on goods in your custody, and what is my exposure?
The exit question matters more than new clients expect. Moving inventory out of a warehouse that is not performing is expensive and slow, and a provider that is vague about the exit is telling you something.
Costs importers routinely underestimate
- Slow-moving inventory storage. Storage is cheap per unit per month and expensive per unit per year.
- Returns processing for consumer categories, particularly apparel.
- Repack and relabel after a marketplace rejects a shipment for a prep error.
- Special handling — oversize, heavy, fragile, hazardous, or anything requiring two people to lift.
- Peak-season surcharges, on both the 3PL and the carrier sides.
- Demurrage and detention when the warehouse cannot take the container on the day it is available — see Shipping from China.
Every one of these belongs in the destination-side block of your landed cost model.
A short onboarding sequence
- Confirm the 3PL can handle your product’s dimensions, weight and any special requirements.
- Send SKU data — dimensions, weights, barcodes, images — before the first inbound.
- Agree the receiving process in writing: ASN format, appointment booking, what happens on a discrepancy.
- Send one small shipment first. Measure receiving time, count accuracy and portal quality against what was promised.
- Test the full loop: place a real order, receive it yourself, then return it and watch how the return is processed.
- Only then commit a full container.
Working with the Rainbow Bridge network
Rainbow Bridge’s own US warehousing operation, 7cang.us, is a Los Angeles-based warehouse serving importers who need receiving, storage, fulfilment, marketplace prep and returns handling close to the Pacific port complex — the same model described above, run by people who work with China-origin freight every day. Rates and capabilities are quoted per account; the services page has the contact route.
Whether you use our warehouse or someone else’s, the sequence is the same: model your real order profile, ask the twelve questions, send one small shipment first, and keep the exit in mind before you commit a container.
