description: "Parcel-scale cold chain: gel packs vs dry ice realities, insulation types, seasonality, label honesty, and validation ship tests for food and cosmetics."
order: 26
schemaType: "Article"
navLabel: "Cold Chain"
navGroup: "Speciality"
navPriority: 1---
Shipping chilled or temperature-sensitive goods by parcel means designing for hours in uncontrolled vans, not for the five minutes between your fridge and the customer's fridge. Packaging, coolant dose, season, carrier transit time, and receiving behaviour all count.
This page is operational literacy — not a substitute for food safety plans or dangerous goods training when dry ice or regulated goods are involved.
If summer lane time exceeds what your insulation + coolant can hold, change the offer (regional shipping, ship windows), not only the gel pack count.
| Type | Notes |
|---|---|
| EPS foam coolers | Strong insulation, bulky, recycling optics vary by city |
| Soft insulated mailers | Lower cost/cube; shorter hold times |
| Vacuum insulated panels | High performance, high cost — niche |
| Corrugated + liners | Hybrid retail-parcel builds |
Pair insulation with the right board outer if you need crush resistance too.
Never guess quantities. Run lane tests with temperature recorders.
See also Pack Testing for drop/crush alongside thermal tests.
Be honest: "Keep refrigerated after opening" is not the same as "arrives ice-cold after 3-day ground in Arizona July." Set delivery expectations in checkout copy. Train support with scripts tied to logger evidence.
A yogurt cup and a chocolate bar are not the same cold problem. Map:
Insulated mailers + gel configuration should be validated with a temperature logger on a real lane, not a desk test in an air-conditioned office.
Dangerous Goods Packaging · Last-Mile Damage · Packaging RFQ