Prioritize multimodal access, slotting flexibility, pick-and-pack throughput, WMS integration, SLA transparency, and carrier density. Evaluate average lead times, cost per pick, and inbound cross-dock capability to ensure the 3PL supports both eCommerce and B2B flow requirements.

Calculate landed cost by combining line-haul rates, last-mile carrier fees, inventory carrying costs, and warehouse handling. Factor in regional fuel and labor variances, potential consolidation savings, and transit-time reductions that can lower safety stock and overall inventory investment.

Key integrations include real-time WMS/API connectivity for inventory visibility, EDI or API order transmission, automated ASN and returns processing, and reporting dashboards for KPIs like OTIF, order cycle time, and order accuracy to enable data-driven decisions.

Look for flexible labor pools, scalable racking and mezzanine capacity, temporary slotting agreements, cross-dock options, and clear surge pricing models. Confirm the 3PL’s history handling peak events and their contingency plans for labor and carrier constraints.

Evaluate carrier pickup frequency, presence of national and regional freight partners, and access to LTL consolidation networks. High carrier density reduces transit variability and provides negotiation leverage for rates, improving service consistency for B2B customers.