Evaluate WMS functionality and real-time integration APIs, inventory accuracy and cycle-count processes, scalable labor and automated picking, SLA definitions for order-to-delivery timelines, and returns processing. These capabilities determine accuracy, cost per order, and ease of systems integration with your storefronts and ERPs.

Location affects last‑mile miles, fuel costs, and transit variability. Proximity to major highways and regional consolidation points reduces transit time and freight spend, while established carrier lanes and parcel access improve predictability for same‑day/next‑day services important to omnichannel fulfillment.

• KPIs: OTIF, inventory accuracy, order cycle time, and chargeback rates.
• Terms: transparent storage and handling rates, seasonal rate caps, minimum volume clauses, SLA remedies, and billing cadence aligned to reporting.

Smaller brands can scale if the 3PL offers flexible pick/pack pricing, pooled inventory programs, and tiered labor. Expect onboarding typically between 4–8 weeks for systems integration, labeling, and process validation; monthly minimums vary by provider but can often be negotiated for growth-stage merchants.