Evaluate SLA metrics (order accuracy, cut-off times), WMS integration (API/EDI), inventory visibility, pick-pack speeds, and returns processes. Also check carrier relationships, cold-chain capability, security protocols, and scalability for seasonal peaks.

Look for temperature-controlled zones, racking systems, pest control, fire suppression, bonded/ customs-ready facilities, and documented quality systems. Certifications or audited processes for food, pharma, or hazardous materials add compliance assurance.

Carrier schedules determine lead times: less frequent sailings or flights increase safety stock needs. Plan around weekly shipping windows, use cross-dock options to reduce handling, and select 3PLs with established consolidations to optimize transit reliability.

Compare storage per m2/pallet, inbound receiving, pick-and-pack per line/item, kitting, returns processing, minimums, surcharges (fuel, peak), and billing cadence. Request sample monthly cost modeling based on your SKU velocity to standardize comparisons.

Negotiate flexible capacity clauses, seasonal staffing plans, and clear KPIs. Use inventory segmentation (buffer vs. fast-moving SKUs), collaborate on demand forecasts, and ensure real-time WMS visibility to reduce stockouts and excess inventory as volume grows.