Evaluate technology compatibility (WMS/portal APIs), SKU handling capability, pick/pack accuracy rates, storage types (bulk vs. racked), and SLAs for same-day vs. standard dispatch. Also verify onboarding support, returns processing, and scalability for peak seasons.

Proximity to arterial roads and major trucking lanes reduces line-haul and last-mile costs and shortens transit windows. Closer sites allow higher delivery frequency and lower safety stock, improving inventory turns and reducing total landed cost.

Primary drivers are storage density and billing model, labor rates for handling and value-added services, inbound/outbound transport charges, and technology or slotting fees. Review how the 3PL prices returns, special projects, and seasonal labor surcharges.

Typical onboarding runs 6–12 weeks: 1–2 weeks for contracting and SOP alignment, 2–4 weeks for WMS integration and test orders, and 2–6 weeks for receiving, putaway, and operational ramp. Complex integrations or custom packing can extend timelines up to 12 weeks.