Prioritize measurable KPIs and facility capabilities: throughput and picking rates, scalable racked capacity, security and inventory control systems (WMS integration), proximity to major road corridors, and contract flexibility for seasonality. Verify carrier connectivity and SLA penalties for order accuracy and lead times.

Primary cost drivers are storage density (cost per pallet/m2), labor productivity, inbound consolidation fees, and last-mile delivery distances. Control costs by optimizing SKU velocity segmentation, negotiating density-based rates, using shared consolidation services, and selecting facilities with strong carrier pools to lower transport premiums.

Carrier access and transit determine cut-off times, delivery SLA variance, and return routing. Facilities near main corridors and port feeders reduce regional transit time and variability, enabling shorter delivery windows for omnichannel pickup and last-mile delivery. Assess carrier frequency and seasonal constraints.

Require demonstrated customs brokerage experience, electronic document handling, HS classification support, bonded storage options if needed, and predefined procedures for inspections and clearance. Ensure the 3PL can manage regulatory changes and provide audit-ready records for cross-border shipments.