Prioritize WMS integration, inventory accuracy, pick-and-pack throughput, returns handling, and cold-chain certification if needed. Track KPIs such as OTIF, order accuracy, lead-time variability, and cost-per-order to compare 3PL performance and alignment with your service-level requirements.

Compare fixed versus variable fees, storage (by pallet vs. cubic), pick/pack and handling charges, inbound receiving costs, accessorials, minimums, and billing cadence. Model typical order profiles and seasonality to reveal the real cost-to-serve and identify potential volume discounts or blended-rate opportunities.

Key factors include proximity to ports and airports, access to major highways and rail links, nearby carrier and courier hubs, and customs or bonded-zone processing times. Facility layout that supports cross-docking and rapid transfer to local carriers also reduces transit time and improves last-mile consistency.