Building a 2–8°C Pharma Shipper: Gel Pack Weights, Placement and Payload Limits

Pharma distributors inherit shipper designs the way people inherit furniture: it fits, nobody remembers why. A 2–8°C lane is less forgiving than a frozen lane, because the failure mode is two-sided. Let the box run cold and you freeze a biologic; let it run warm and you lose the lot. Gel packs sit i…