Prioritize throughput capacity, dock and staging configuration, WMS integration (real-time inventory/SKU management), pick-pack speed, returns processing, and SLA guarantees. Assess carrier density, regional transit times, and the 3PL's experience with similar order profiles to ensure alignment with volume variability and service expectations.

Closer proximity reduces linehaul miles and last-mile surcharges, enabling faster transit and lower per-order shipping costs. A site with strong carrier density supports better rate negotiation and routing flexibility during peak periods, improving on-time performance and customer experience.

Look for flexible racking, modular pick zones, sufficient dock doors for cross-dock operations, scalable labor resources, and a WMS that supports dynamic slotting. Confirm the provider's ability to add temporary labor, adjust storage density, and implement rapid SOPs for promotional or seasonal launches.

Negotiate transparent tariff structures (storage, pick/pack, returns), performance KPIs (OTIF, inventory accuracy), liability and insurance terms, minimum volume commitments, and exit provisions. Include clauses for seasonal rate adjustments, carrier pass-throughs, and responsibilities for inventory reconciliation to manage cost and risk.