Prioritize port/airport proximity, bonded/free‑zone availability, WMS/API integrations, order accuracy and pick/pack SLA, last‑mile carrier coverage, and reverse logistics capability. Also assess container handling, truck access and the 3PL's customs clearance experience to reduce transit variability.

Infrastructure elements — bonded space, racked storage density, cross‑dock capacity and temperature control — affect handling time, inventory holding costs and spoilage risk. Closer port adjacency reduces drayage and dwell fees, while better WMS control lowers labor costs through higher pick density and fewer errors.

Negotiate SLAs for order lead time, inventory accuracy, case/piece pick accuracy, on‑time dispatch and claims resolution windows. Define chargeback rules, minimums, notice periods for scale changes, onboarding timelines and data integration standards for EDI/API reporting.

Key services include bond/temporary storage, cross‑dock and consolidation, palletizing and kitting, temperature‑controlled storage, and in‑house customs brokerage. Also evaluate long‑haul trucking partners, container deconsolidation expertise and the 3PL’s familiarity with regional distribution lanes.