Prioritize transit times to key markets, carrier network coverage, customs and VAT processing experience, warehouse capabilities (racking, climate control, packing lines), and integration with your OMS/WMS. Also evaluate SLA guarantees, returns handling, and ability to scale capacity seasonally.

Customs and tax handling affect landed cost and lead times. Choose 3PLs with experience in cross-border documentation and bonded or customs-cleared handling. Consider consolidated shipments, pre-clearance services, and tax-compliant invoicing to reduce delays and unexpected fees.

Key features: integrated WMS with API connectivity, zone and temperature-controlled storage, pick-and-pack lines, pallet racking, barcode/RFID scanning, and returns processing. These capabilities enable accurate order routing, faster fulfillment, and better inventory visibility.

Smaller markets typically offer lower fixed costs and specialized service flexibility but may have fewer carrier frequency options and longer transit windows to distant urban centers. Assess total landed cost, service coverage, and the 3PL's ability to aggregate volumes and negotiate carrier rates.