Prioritize measurable KPIs (order accuracy, on-time ship), inventory visibility (real-time WMS access), network connectivity to regional carriers, capacity flexibility for seasonality, and value-added services (kitting, returns). Also review safety stock policies and SLA penalties to align costs with service needs.

Carrier access influences routing options and lead times; choose 3PLs with multiple carrier contracts and local drayage partners to reduce variability. Validate typical transit windows to major customer clusters and ask for historical on-time performance metrics to estimate SLA compliance.

Key features include multi-temperature storage, racked pallet capacity, dedicated picking zones, cross-dock capability, and a modern WMS with EDI/API integrations. Ensure availability of secure loading docks, flexible slotting, and contingency power for temperature-sensitive inventory.

Negotiate transparent fee schedules (storage, pick, pack, handling), volume discounts, minimums, and chargeback terms. Include performance-based SLAs, audit rights, and clear demurrage/drayage responsibilities. Model total landed cost including inbound routing, customs, and last‑mile fees before signing.