Look for proven pick-and-pack accuracy, batch/zone picking options, returns processing workflows, and cold-storage if needed. Require KPI reporting (OTIF, pick accuracy, dwell time), integration via API/EDI for inventory and order flow, and documented contingency plans for peak season surges.

Proximity to ports and primary highways reduces inbound drayage and local trucking time, lowering landed cost. Closer placement to industrial clusters or customer density centers shortens last‑mile routes, reduces carrier charges, and improves SLA adherence for expedited and economy services.

Negotiate SLA items for order lead time, pick accuracy, inventory accuracy, dwell limits, and chargeback terms. Insist on transparent reporting cadence for KPIs, corrective action windows, and predefined rates for surge throughput and seasonal storage.

Compare TCO including rent, labor, utilities, and IT against capital expense and fixed operating costs of owned space. Evaluate speed-to-market, flexibility to scale, carrier contracts, and value-added service capabilities—3PLs reduce capex and provide operational elasticity but may trade some control over processes and margins.