3PL Fulfillment Cost Structure — The Complete Breakdown of Storage Fees, Pick & Pack, and Quote Line Items
"How on earth is a 3PL fulfillment rate actually put together?" It's the question we hear most often from business owners looking into fulfillment for the first time. Drawing on RUNIC's experience running a wide range of client accounts out of our Gimpo center, we've laid out the cost structure and the line items you should always check before accepting a quote.
3PL Costs Fall Into Four Broad Categories
1. Storage Fee
This is the cost of holding your goods in the warehouse. It's typically calculated on one of two units:
- By area: A flat monthly rate per pyeong or per square meter. Works well for large items or bulk case storage.
- By slot / case: A flat monthly rate per SKU or per case. Works well for high-mix, low-volume assortments.
Watch out for: Beyond the headline "base storage fee," quotes can hide extra terms such as a "minimum billable area," an "additional area rate," or "surcharges tied to inventory turnover."
2. Pick & Pack Fee
This is the cost of picking an order, packing it, applying the shipping label, and sending it out. It's priced per order, and the following factors drive the rate:
- SKUs per pick: How many distinct items go into one order (1 vs. 5 vs. 10+).
- Packing complexity: A simple box vs. combined packing vs. cushioning material vs. heat-sealed or chilled packing.
- Label and invoice type: Standard shipping label vs. channel-specific label vs. an attached invoice.
3. Inbound & Returns
Receiving inspection when goods come into the warehouse, return collection and processing, and repacking or QC work are all billed at separate rates. When a large volume comes in — as with a new marketplace launch or the start of a season — these costs add up fast, so spell them out at the quoting stage.
4. Add-ons
- WMS usage fees / system integration costs
- Carrier freight (billed at cost or negotiated rate)
- Issuing invoices and tax invoices
- Special work (labeling, bundling, seasonal packaging)
- Rush and holiday shipment surcharges
Rough Market Rates (For Reference)
Figures vary by product category, volume, and scope of service, but as of 2026 the typical rate ranges for e-commerce fulfillment are:
The figures above are market-average reference points. A RUNIC quote is calculated separately after analyzing each client's volume, products, and shipping patterns.
Seven Things to Always Check on a Quote
- Minimum billable units: Confirm the minimum billing terms for area, case count, and order count alike.
- Slip charge: Whether the label and box costs are included in the pick & pack fee.
- Carrier freight: Billed at cost vs. negotiated rate, plus which carrier.
- Inbound inspection depth: Visual only vs. quantity check vs. unit-level inspection.
- Scope of returns processing: Collection only vs. repacking + QC + return to stock.
- WMS cost: Provided free / flat monthly rate / usage-based metering.
- Transport integration: Whether fulfillment and transport are handled by a single partner.
Where the Savings Are
Even at the same volume, the rate can shift significantly depending on how the operation is run. Here are the savings levers that pay off most often:
- Automated combined packing: When one customer orders several items, automatic order consolidation cuts pick & pack and freight costs.
- SKU cleanup: Trimming low-turnover SKUs lowers storage fees.
- Pick-path optimization: Placing best-sellers close to the pick path.
- Consolidated transport: When fulfillment and transport sit with one partner, freight and settlement run more efficiently.
- WMS API integration: Cutting manual handling time creates room to negotiate a lower pick & pack rate.
RUNIC's Cost-Structure Advantages
RUNIC operates roughly 3,000 pyeong on the 4th floor of K-One Gimpo Logis, running our own WMS and TMS together with a freight brokerage network under one roof. The result:
- No double transport margin: We arrange our own trucking rather than sourcing outside carriers, keeping freight efficient.
- Our own WMS, provided free: Real-time inventory and shipment tracking with no separate system usage fee.
- Flexible area units: Scale up or down in one-pyeong increments as your season or growth demands.
- Direct 25-ton wing-body berthing: A wide spiral ramp cuts inbound time and freight cost.
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