Prioritize scalable pick-and-pack throughput, real-time WMS integration, returns processing, multi-channel inventory visibility, and carrier-neutral parcel consolidation. Also evaluate slotting flexibility and ability to handle seasonal SKU peaks.

Proximity reduces inland drayage and transfer times, lowering freight costs and improving order cycle times. Shorter transit supports leaner inventory buffers and faster replenishment for cross-border SKUs.

Key KPIs: on-time-in-full (OTIF), pick accuracy, order cycle time, and cost-per-order. Contract terms should include clear SLAs, volume tiers, ramp-up provisions, chargeback rules, and audit rights to align costs with performance.

Verify dock capacity, yard operations, high-bay racking, heavy-lift equipment, secure staging areas for full-truckload consolidation, and dedicated B2B fulfillment lanes to ensure efficient palletized workflows.

Assess the 3PL’s capacity-flex models, temporary labor pools, geographic network (satellite warehouses), and ability to integrate with your ERP/WMS. Look for documented onboarding timelines and case examples of seasonal scaling.