Prioritize port proximity, warehouse layout and racking density, handling equipment, cross-dock throughput, WMS integration and reporting, customs clearance experience, SLA for order cycle times, and scalability for peak seasons. Measure KPIs such as order lead time, on-time shipping rate, inventory accuracy, and cost-per-pick.

Carrier frequency and feeder schedules determine sailing windows and consolidation opportunities; limited sailings increase dwell time and freight premiums. A 3PL with strong carrier relationships and consolidation services can smooth outbound schedules, reduce per-unit ocean cost, and improve predictability for omnichannel replenishment.

Verify the 3PL's customs brokerage capabilities, experience with HS classification and origin documentation, bonded storage offerings if needed, electronic filing and data exchange, and track record for timely clearance. Clear responsibilities for duties, inspections, and paperwork should be contractually defined.

Include warehousing rent and handling fees, inbound and outbound freight, cross-dock and consolidation costs, duties and customs clearing fees, pick/pack and returns handling, inventory carrying costs, technology and transaction fees, and service-level penalties or incentives to reflect real operational costs.