Prioritize carrier connectivity (road and air), warehouse layout and racking, WMS/OMS integration, labor skill and availability, and proximity to key customers. Review cross-dock capability, pick-and-pack throughput, SLA reporting, and scalability to handle peak season volume.

3PL pricing commonly combines storage per pallet/sq ft, handling fees per pick/pack, inbound/outbound pallet charges, and value-added service fees. Major cost drivers: labor rates, transport distances, inventory velocity, and required service levels — all influence total landed cost and margin.

Set expectations based on corridor type: regional deliveries often achieve next- or second-day service to nearby nodes; cross-border or long-haul lanes will be longer. Confirm carrier schedules, pickup cutoffs, and seasonal variability with the 3PL to model reliable lead times.

Review the 3PL's carrier contracts and network maps, request delivery success and on-time metrics, and validate last-mile partners in target postcodes. Ask for references, proof of insurance, and contingency plans for capacity constraints or route disruptions.

Confirm the 3PL's customs brokerage capabilities, import/export documentation processes, bonded storage if needed, and local compliance for tariffs and permits. Verify experience handling documentation, duty calculations, and inspections to avoid delays and penalties.