Prioritize SLA performance, dock and staging capacity, inventory accuracy, and available value‑added services (kitting, returns processing). Also evaluate carrier connectivity, transport lanes to your customer base, and the provider’s WMS/EDI capabilities to support omnichannel order orchestration.

Proximity to inland customer clusters can reduce last‑mile mileage and fuel spend, while lower facility and labor costs can reduce per‑order handling. Factor in road condition, carrier frequency, and customs/tariff handling if cross‑border flows apply to estimate landed cost and lead time variability.

Look for a robust WMS with real‑time inventory visibility, scalable API or EDI integrations for order flow, barcode/RFID support for accuracy, and reporting dashboards. These reduce stockouts, speed pick‑pack processes, and support rapid scaling during peak seasons.

Negotiate modular pricing (storage tiers, pick/pack bands), minimum notice for seasonal capacity, performance-based SLAs, and transparent passthroughs for carrier fuel or tariff changes. Include exit provisions and audit rights to manage long‑term risk.

Assess each 3PL’s carrier roster, scheduled pickup frequencies, and relationships with national and regional carriers. Confirm pallet and LTL handling capabilities, typical transit times to your major account locations, and any contracted freight rates that could lower costs.