Prioritize WMS capabilities and API connectivity for real-time inventory, proven pick-and-pack accuracy, SLA metrics (OTD, pick accuracy), returns handling processes, racking and automation readiness, and carrier integrations. Validate reporting cadence and sample data feeds before contracting.

Shorter lanes to ports/airports reduce lead times and handling costs; direct access to primary carriers lowers last-mile rates and improves delivery windows. Choose a 3PL with established lane frequency, consolidation options, and reliable LTL/FTL partners to optimize total landed cost.

Negotiate transparent line-item pricing (storage, handling, pick, returns), minimums and bandwidth clauses, KPI-based SLAs with remedies, monthly reconciliations, and API access to transactional data. Include seasonal flex provisions and audit rights for invoice validation.

Use demand segmentation to assign fast-moving SKUs to nearer fulfillment nodes, implement zone-skipping for regional orders, maintain safety-stock levels tied to lead-time variability, and leverage multi-sku slotting to improve pick density and lower storage fees.