Prioritize a proven WMS with API connectivity, scalable pick‑and‑pack throughput, accurate inventory visibility, SLA-backed order accuracy and cut‑off times, value‑added services (kitting, returns), and customs/bonded handling if you import goods. Ensure the provider documents uptime, error rates, and integration turnaround.

Carrier access affects trucking lead times, freight rates, and routing flexibility. Use providers that offer multiple carrier lanes, consolidated LTL options, and predictable road links to major distribution points. Shorter transit windows reduce safety stock and inventory carrying cost while enabling tighter SLAs to end customers.

Negotiate clear storage tiers, throughput-based pick/pack pricing, minimums and overage formulas, and transparent billing cycles. Contract KPIs such as order accuracy, OTIF, pick velocity, inventory reconciliation frequency, and chargeback terms. Include audit rights and escalation paths for disputes.

Choose bonded warehousing when deferring duties or performing value‑added operations on imported goods improves cash flow or compliance. Select cold‑chain providers when handling temperature‑sensitive products (food, pharma) to meet regulatory controls and shelf‑life requirements. Match provider certifications and monitoring capabilities to your product and compliance needs.