Prioritize transit-time metrics to core customer zones, WMS and API integration, SLA guarantees, reverse logistics capabilities, and cold-chain or bonded storage if required. Also evaluate yard capacity, cross-dock throughput, and the 3PL’s carrier network to ensure predictable lead times and cost-to-serve alignment.

Facilities near airports and trunk highways reduce last-mile mileage and handling steps, lowering carrier charges and transit variability. Closer proximity improves same-day or next-day coverage, decreases fuel and drayage costs, and shortens inbound lead times for cross-border shipments.

Require a modern WMS with real-time inventory, EDI/API order and tracking integrations, configurable order-routing, barcode/RFID support, and returns-management workflows. Verify reporting, SLA dashboards, and the ability to integrate with marketplaces and your ERP for unified inventory control.

Compare line-item rates (storage, picks, packing, kitting), inbound/outbound handling assumptions, minimum monthly charges, and surcharge triggers. Model total landed cost by SKU and channel, include peak season scenarios, and require transparent billing detail and performance credits for missed SLAs.

Confirm the 3PL’s bonded-warehouse capabilities, customs brokerage partnerships, handling of duties/VAT, and documentation controls for import/export compliance. Ensure HS code accuracy, audit-ready records, and clear processes for duty deferral or temporary admission where applicable.