Prioritize measurable capabilities: pick-and-pack throughput, order accuracy, receiving and putaway speed, temperature control if needed, and racked vs bulk capacity. Also evaluate WMS/API integration, inventory visibility, contract clarity on billing (storage, handling, returns), and the 3PL’s ability to scale during peak windows.

Port and carrier access determine modal choices, consolidation frequency, and transit variability. Strong coastal links and reliable feeder services reduce consolidation delays and per-shipment cost; limited inland infrastructure increases last-mile time and handling. Assess transit windows, vessel/liner schedules, and carrier coverage to estimate true landed cost and delivery SLA feasibility.

Require a WMS with real-time inventory, API/EDI connectivity, mobile scanning, ASN support, order orchestration across channels, and standard reporting. Confirm ease of integration with your ERP, marketplace platforms, and carriers plus regular data exports and dashboards for cycle counts, KPIs, and exception handling.

Compare fixed vs variable fees, storage tiers, receiving and handling charges, pick/pack rates, minimums, and returns processing costs. Scrutinize SLA items—order lead time, accuracy, claim handling, uptime of integrations—and penalties. Also request capacity ramp plans, peak staffing arrangements, and cost models for volume growth to understand true total cost of operations.