Prioritize multimodal access (port and airport proximity), bonded storage options, real-time WMS/OMS integration, scalable labor and racking capacity, and proven last-mile courier partnerships. Confirm peak-season staffing plans and value-added services like kitting and returns processing.

Carrier density reduces line-haul and parcel rates and increases routing options, lowering cost-to-serve. Dense last-mile networks shorten delivery windows but can raise urban handling costs. Mitigations include micro-hubs, optimized slotting, and multi-carrier contracts to balance cost and SLA.

Negotiate inventory accuracy, picking/packing accuracy, order cycle time, on-time dispatch rate, and clear chargeback terms for errors. Include SLA credits, audit rights, data access frequency, and contingency clauses for peak volume or carrier disruptions.

Confirm the 3PL's bonded warehouse licensing, customs brokerage capabilities, VAT and duty handling procedures, and EDI links to customs authorities. Verify experience with HS code classification, compliant documentation, and processes for fast release and audit readiness.