Prioritize WMS/API integration, inventory accuracy, throughput capacity, pick/pack metrics, and returns handling. Also evaluate carrier pickup windows, cross-dock options, value-added services (kitting, labeling), SLA penalties, and transparent cost-to-serve models to ensure alignment with your fulfillment strategy.

Location near primary roads and regional corridors reduces line-haul distance and last-mile delivery time, lowering fuel and carrier fees. Shorter transit windows increase delivery predictability and enable tighter inventory turns, which reduces safety stock and overall logistics spend.

Look for flexible storage configurations, scalable labor agreements, cross-dock space, mezzanine capacity, and proven peak-season throughput metrics. Confirm the 3PL’s staffing plans, temporary storage options, and historical performance during high-volume periods.

Require real-time WMS APIs, EDI or RESTful connectivity, ASNs, inventory reconciliation reports, and exception dashboards. Ensure access to configurable KPIs (OTD, order accuracy, dwell time) and regular operational reviews to maintain transparency and continuous improvement.