Prioritize measurable service levels (pick accuracy, order cycle time), inventory visibility (real-time WMS access), and scalable labor models. Also assess dock configuration, racking density, cross-dock capability, and carrier integrations that align with peak volume requirements.

Closer proximity reduces drayage and last-mile kilometers, improving transit reliability and lowering freight spend. It also enables more flexible routing for LCL/FCL imports and faster replenishment cycles for time-sensitive eCommerce inventory.

Include warehouse storage density, handling rates (per pick/pack), inbound receiving charges, and value-added service fees. Model freight savings from reduced transit zones and lower damage/returns rates driven by improved handling. Consider seasonality and minimum usage fees.

Confirm the 3PL provides customs clearance support, bonded storage options if needed, accurate shipment documentation, and integration with freight forwarders. Also verify export/import recordkeeping, HS code handling experience, and EDI or portal-based trade filings for regulatory accuracy.