Prioritize WMS compatibility, SKU velocity handling, pick-and-pack throughput, returns processing, and SLA enforcement. Also verify cross-dock capacity, value‑added services (kitting/assembly), security, and integration with your order management and carrier booking systems.

Verify proximity to container terminals and major highways, availability of refrigerated space if needed, local drayage providers, and frequency of LTL/truckload carriers. Check for intermodal options, container yards, and customs brokerage support near the chosen facility.

Compare fixed costs (rent, utilities), variable handling fees (inbound receiving, pick-pack, putaway), transportation (first/last mile, drayage), and ancillary charges (storage tiers, returns). Model cost per order and landed cost impact at scale to see true economics.

Require KPIs such as order cycle time, OTIF, inventory accuracy, pick rates, dock-to-dispatch time, and return turnaround. Confirm the 3PL’s ability to add temporary labor, expand footprint, and offer surge inventory management or short-term storage during peak seasons.