Refrigerated delivery solves the transit problem. But for food brands selling direct to consumers — subscription boxes, click-and-collect, gifting — the product's temperature integrity doesn't end when it leaves the van. It ends when the customer opens the box. The packaging you use is the bridge between the two, and getting it wrong can undo everything your cold chain got right.

Why Packaging Is the Last Line of Defence in Cold Chain

Even a perfectly executed refrigerated delivery can fail at the final handoff. The driver leaves the box on a doorstep. The customer is out. The box sits in a south-facing porch for two hours. If the packaging is uninsulated corrugated cardboard with a single ice pack, the product will be outside specification long before it's opened.

This is especially critical for DTC food brands. Unlike B2B deliveries where a buyer is present at handoff, doorstep delivery to consumers has an unpredictable dwell window. Your packaging needs to hold temperature for longer than the transit time alone — it needs to cover transit plus a realistic doorstep window of one to three hours.

The practical implication: your cold chain packaging specification should be set based on worst-case dwell time, not average transit time.

The Four Main Cold Chain Packaging Types

There are four formats that cover the vast majority of food brand cold chain needs. Each has a distinct use case:

  • Insulated shipping boxes (EPS foam or foil-lined cardboard): The backbone of cold chain packaging for shipments requiring 24–48 hours of thermal protection. EPS (expanded polystyrene) liners inside a corrugated outer box deliver the best insulation performance per unit cost. Foil-lined corrugated is more eco-friendly, fully recyclable, and adequate for chilled (5–10°C) applications over same-day to next-day windows. EPS remains the standard for 0–5°C over 24h+.
  • Gel ice packs: The most common coolant for 0–10°C applications. Pre-frozen gel packs placed inside the insulated box maintain temperature for 12–24 hours depending on ambient conditions, insulation quality, and pack-to-product ratio. Reusable if the customer returns them; otherwise they go in standard household waste. The workhouse option for meal prep, juice, and ready meal brands.
  • Phase change materials (PCMs): Engineered panels designed to melt at a specific target temperature — typically 4°C or below — absorbing heat in the process and holding the interior at or near that temperature. More expensive than gel packs but significantly more precise and reliable for extended or temperature-critical applications. Used in pharmaceutical logistics and increasingly by premium food brands where compliance documentation matters.
  • Dry ice (solid CO₂): Surface temperature around −78°C, used for sub-zero and frozen applications. Sublimes to gas (CO₂) rather than melting to liquid, making it clean and residue-free. However: dry ice is classified as a hazardous material (Class 9) for transport purposes, requires specific labelling, and must not be placed in airtight containers. Not appropriate for standard consumer food delivery — its use case is frozen goods and pharmaceutical cold chain.

Choosing the Right Combination for Your Product

The right combination depends on your product type, target temperature, and delivery window. A practical guide:

  • Fresh meat and fish: EPS-lined corrugated box + gel packs frozen to −18°C, or PCM panels if you need 0–4°C precision. For same-day London delivery, gel packs are sufficient. For next-day or 24h+ transit, upgrade to PCM or increase gel pack volume.
  • Meal prep and ready meals: EPS or foil-lined box + gel packs. For same-day delivery within London, a foil-lined box with two 400g gel packs is typically adequate to hold 4°C across a 4–6 hour window including doorstep dwell. Test your specific configuration in summer conditions before committing to a spec.
  • Cold-pressed juice and cleanse products: Foil-lined box + gel packs, targeting 4°C or below. Juice brands should confirm their packaging holds temperature for the full transit-plus-dwell window, as HPP (high-pressure processed) juices degrade faster at elevated temperatures than heat-treated alternatives.
  • Bakery: Most artisan bakery products (sourdough, pastries, croissants) are fine at 10°C+. The primary packaging goal is condensation prevention, not active chilling — an insulated bag or foil-lined box prevents temperature swings that cause condensation on packaging. No active coolant needed.

Eco Packaging: The Growing Pressure on Food Brands

EPS foam is effective, but customers notice it — and many now hold it against brands. A subscriber who opens their meal prep box to find a moulded polystyrene case they can't recycle is increasingly likely to flag it publicly or factor it into renewal decisions.

The good news: eco alternatives have improved substantially in the past three years. Recycled wool liners now perform comparably to low-density EPS for chilled applications, are fully compostable, and carry strong brand storytelling value. Recyclable foil-lined corrugated boxes have improved their thermal retention. Plant-based gel pack alternatives (made with non-toxic water gels in compostable casings) are entering the market.

The honest trade-off: eco alternatives still cost more per unit than EPS at comparable volumes, and for 0–5°C applications over 24h+, EPS remains the most reliable option. The sweet spot for brands making the switch is same-day or next-day delivery at 5–10°C — this is where wool liners and foil-lined corrugated now perform strongly enough to justify the sustainability premium.

Custom Branded Cold Chain Packaging

For DTC food brands, the unboxing moment is part of the product experience. Custom-printed cold chain packaging — your brand colours on the outer box, branded inserts, a custom gel pack label — turns a functional necessity into a touchpoint.

The economics of branded cold chain packaging have shifted. Minimum order quantities for custom-printed foil-lined boxes start from around 500 units for straightforward designs. Print turnaround is typically 3–4 weeks from artwork approval. For brands doing 100+ deliveries per week, the per-unit cost of custom packaging is often justified by the reduction in customer service queries ("my box looked unmarked") and improvement in subscription retention.

Chillio is expanding its packaging range to cover the main formats for same-day and next-day delivery. Browse what's available — or join the notify list to be first to know when new formats land.