Prioritize capabilities that directly affect customer lead time and cost-to-serve: inventory accuracy, real-time WMS integration, cross-docking, pick-and-pack throughput, and reliable carrier connectivity. Evaluate SLA metrics for order cycle time and error rates to compare providers effectively.

Key levers include consolidated inbound receipts, optimized pick-and-pack operations, regional cross-docks to reduce last-mile distance, and negotiated carrier tariffs. A 3PL can also advise on inventory placement to minimize expedited transport spend and reduce stockouts.

Require a WMS with API connectivity, barcode/RFID scanning, configurable workflows for kitting/returns, temperature-controlled options if needed, and clear reporting dashboards for inventory KPIs. Confirm backup power and security protocols to protect continuity.

Assess road reliability for inland distribution, port access windows, customs handling if applicable, labor availability and seasonal fluctuations, and the provider's contingency plans for weather or supply disruptions. Consider proximity to major carrier routes and the 3PL's carrier network depth.