Prioritize tangible metrics and capabilities: throughput capacity (orders/hour), dock count and trailer staging, WMS integration and API readiness, inventory accuracy rates, and value‑added services (kitting, returns). Also evaluate scalability, workforce reliability, and carrier connectivity to ensure the 3PL can meet peak season demands without service degradation.

Carrier density and last‑mile partnerships directly impact transit times, delivery frequency, and shipping rates. Strong local networks reduce deadhead miles, enable more predictable SLAs, and support cost‑effective zoned pricing. Assess parcel and LTL coverage, contractual rates, and consolidation options to optimize final‑mile spend.

Negotiate clear SLAs and KPIs: order accuracy, on‑time shipments, dock-to-invoice cycle time, inventory reconciliation frequency, and chargeback terms. Include scalable capacity guarantees, dispute resolution timelines, and penalties/incentives tied to performance to align the 3PL with your customer experience goals.

Prioritize facilities with modern racking and mezzanine options, adequate dock and trailer staging, robust power and IT connectivity for WMS/TMS, security and compliance features, and flexible footprint for expansion. Also evaluate proximity to major highways, rail interchanges, and labor availability to ensure sustainable operating costs.