Prioritize proximity to major roads and ports, available carrier pools, WMS capability and integrations, slotting and SKU-density options, labor skill and shift patterns, security and insurance coverage, and the 3PL's track record on SLAs for pick/pack accuracy and lead-time consistency.

Model landed cost including local transport to port, customs fees, inland trucking, warehousing fees, and inventory carrying cost. Evaluate transit time variability, consolidation opportunities, and carrier reliability to balance inventory levels against service targets and distribution frequency.

Require measurable SLAs for order cycle time, accuracy, and on-time dispatch; API or EDI/WMS integrations with your OMS; scalable labor plans for peaks; returns processing, inspection, and refurbishment; plus kitting, labeling, and custom packaging services to support omnichannel demand.

Confirm the 3PL's customs brokerage capability, bonded warehousing options, and familiarity with regional tariff and transit permits. Assess local trucking availability, documentation accuracy, container deconsolidation, and the partner's relationships with carriers for predictable cross-border lanes.