Prioritize inventory accuracy (cycle counts, WMS integration), pick-and-pack throughput, returns processing, and SLAs for order-to-ship times. Also evaluate carrier connectivity, slotting flexibility for seasonal SKU velocity, and tech APIs for OMS/ERP integration to maintain visibility and minimize manual reconciliation.

Location drives access to major highways and ports, which reduces drayage and linehaul costs and shortens transit windows. Facilities closer to consumer centers lower last-mile spend and enable faster delivery promises—key for omnichannel orders and reducing split-shipment complexity.

Negotiate transparent cost-to-serve pricing, performance-based KPIs (OTD, accuracy), minimum throughput commitments, and clauses for seasonal volume swings. Include chargeback caps, inventory ownership terms, and clear billing reconciliation processes to avoid dispute-driven cost overruns.

Require a modern WMS with API support for OMS/ERP, real-time EDI or RESTful feeds, barcode/RFID support, and reporting dashboards. Ensure the 3PL can support automated ASN, batch shipping, and exception workflows to reduce manual interventions and improve pick/pack accuracy.