How to Ship Perishable Food Without Dry Ice

Why Consider Alternatives to Dry Ice?

Dry ice works. It keeps products frozen at -109.3°F (-78.5°C) and sublimates cleanly — no messy liquid to deal with. But it comes with three problems that scale poorly as your shipping volume grows:

1. Cost

Dry ice runs $1.00–$1.25 per pound from industrial suppliers at volume, and it's a single-use expense — it sublimates completely in transit. A typical overnight shipment (12×12×12 box, 30 lbs pre-frozen) needs 3–4 lbs of dry ice. A 2-day shipment needs about 5.5 lbs. At 100 shipments per week, you're spending $350–$700 per week on a consumable that disappears before the customer opens the box.

2. Regulatory Burden

Dry ice is classified as a Class 9 hazardous material by the DOT under 49 CFR 173.217 [1]. Every package requires a UN 1845 label with the net weight in kilograms, plus shipper and recipient contact information. International shipments add IATA Packing Instruction 954 compliance [2]. Miss any of this and your carrier can refuse the package, delay it, or flag your account for compliance review.

3. Safety and Handling

Dry ice causes burns on skin contact and produces CO₂ gas as it sublimates. It requires proper ventilation during storage and handling, staff training, and careful packaging to prevent pressure buildup in sealed containers. None of this is insurmountable, but it adds overhead to every shift in your fulfillment operation.

If your products need to stay refrigerated (not frozen), all three of these problems disappear when you switch to gel packs.

Gel Packs: The Primary Dry Ice Alternative

Gel packs are sealed pouches filled with a water-based gel that absorbs and releases cold energy over an extended period. When frozen, they maintain refrigerated temperatures (32–40°F) for 24–48 hours in a standard insulated container — long enough for overnight and most 2-day shipments.

How Gel Packs Work

Unlike dry ice, which sublimates at a fixed temperature (-109.3°F), gel packs provide a gradual, controlled cooling effect. They absorb ambient heat slowly, maintaining a consistent cold environment without the extreme temperature swings that dry ice can cause. This is actually better for many food products — dry ice can cause freezer burn on fresh items, while gel packs maintain a gentle, steady chill.

Types of Gel Packs

• Standard water-based: The most common and affordable option. Freeze them, pack them, ship them. $0.50–$1.50 each depending on size and volume pricing.
• Phase-change materials (PCMs): Engineered to maintain a specific temperature range (e.g., 33–39°F) for longer durations. More expensive ($2–$5 each) but provide tighter temperature control for sensitive products like raw seafood or dairy.
• Biodegradable/organic: For brands with sustainability commitments. Made from plant-based gels in compostable packaging. Slightly higher cost but appealing to eco-conscious customers.

Sourcing Gel Packs

Don't use random gel packs from a retail store. Source from cold chain packaging suppliers who can provide consistent quality, specific sizes for your packaging, and bulk pricing. Request samples and test them with your actual products and insulated containers before committing to a bulk order. Ask other DTC operators in your network for vendor recommendations — the quality difference between suppliers is real.

Insulated Containers

Gel packs need an insulated environment to work. The container is half the equation — the best gel packs in the world won't help if they're in a standard corrugated box with no thermal protection.

Polyurethane Foam

Polyurethane delivers roughly 2× the R-value per inchcompared to EPS — the best thermal performer available. Lightweight and conforms well to products. The trade-off is cost (the most expensive option) and environmental impact (not biodegradable). Use when maximum thermal performance matters for longer transit times or extreme heat.

EPS Foam Coolers

Expanded polystyrene (EPS) foam coolers are the industry workhorse — strong thermal performance at a lower cost than polyurethane. They're lightweight, moisture-resistant, and available in a wide range of pre-formed sizes.

• 1.5-inch walls: Adequate for overnight shipments in moderate climate zones
• 2-inch walls: Better for 2-day transit or shipments during summer months
• Cost: $3–$8 per unit depending on size and volume

Cornstarch-Based Insulation

A newer sustainable option that performs comparably to EPS and dissolves in water. More expensive and less widely available, but increasingly popular with eco-conscious brands as a sustainability differentiator.

Insulated Liners

If you want to use your existing branded corrugated boxes, insulated liners are a reflective, foil-backed film that lines the interior walls. They provide less insulation than EPS foam but work for short-transit, temperature-tolerant products. Cost: $1–$3 per liner.

Reflective Bubble Mailers

For small, lightweight products like artisan chocolates, cheese, or thin seafood portions, reflective metalized bubble mailers offer basic thermal protection in a compact format. They're essentially a refrigerated version of poly mailers. Best for overnight shipments only and for products with wider temperature tolerances.

Choosing the Right Size

Your container needs to fit the product, gel packs, and minimal void fill — with no room for the contents to shift during transit. A box that's too large wastes gel pack cooling on empty air and increases dimensional weight (which is how carriers bill most express shipments). A box that's too small crushes the product or doesn't leave room for adequate cooling.

If you sell multiple SKU combinations, you'll likely need 2–3 container sizes to cover your common order profiles without over-packaging.

Gel Packs vs. Dry Ice: Direct Comparison

The comparison makes the decision framework clear: if your product can survive at 32–40°F, use gel packs. If it must stay at or below 0°F, you need dry ice. Many brands ship both types of products and need a system that can automatically split mixed-temperature orders into the right packaging configuration.

Packaging Perishable Food Without Dry Ice: Step by Step

1. Pre-cool everything. Freeze gel packs for at least 24 hours. Pre-chill your insulated container in a walk-in cooler for 30 minutes if possible. Pack products that are already at refrigerated temperature — not room temperature products you're trying to cool down.
2. Line the container. Place a waterproof barrier (poly bag) inside the insulated container to prevent condensation from leaking through the outer box.
3. Layer gel packs strategically. Place gel packs on the bottom and sides of the container. Position them between layers of product for even cooling. Don't cluster all gel packs in one spot — distribute them throughout the package.
4. Eliminate air pockets. Fill voids with crumpled newsprint, bubble wrap, or additional gel packs. Air pockets are warm spots that accelerate temperature rise.
5. Top with gel packs. Place a final layer on top before closing the insulated container. Cold air sinks — having gel packs on top creates a blanket effect.
6. Seal and box. Close the insulated container and place it inside a sturdy outer corrugated box. Seal with quality packing tape — not water-activated tape, which loses adhesion when wet from condensation.
7. Label as perishable. Mark the outer box "PERISHABLE — KEEP REFRIGERATED" so handlers and the recipient know to prioritize it.

How many gel packs? The general guideline is 1–2 standard gel packs per pound of product for overnight shipments, and 2–3 per pound for 2-day transit. But this varies based on insulation quality, ambient temperature, and product type. Test your packaging configuration with temperature loggers before committing to it at scale.

When You Still Need Dry Ice

Gel packs are not a universal replacement. There are products and scenarios where dry ice is the only option:

• Frozen products (0°F or below): Frozen meat, frozen seafood, ice cream, frozen prepared meals. Gel packs cannot maintain sub-zero temperatures.
• 3-day transit with no margin: If your product is highly sensitive and transit is 3+ days, dry ice's longer thermal duration may be necessary even for refrigerated items.
• Extreme summer heat: When ambient temperatures exceed 100°F during transit (common in Southwest US during summer), gel packs deplete faster. Some brands add a small amount of dry ice as a backup even for refrigerated products during July–August.

For brands that ship both frozen and refrigerated products, the answer is usually: gel packs for refrigerated, dry ice for frozen. If a customer orders both in the same cart, you need automated order splitting to route each product type into the right packaging — otherwise you're either over-spending on dry ice for refrigerated items or risking spoilage on frozen ones.

For a deeper dive on shipping frozen food specifically, see our guides on FedEx frozen food shipping and UPS frozen food shipping.

Cost Analysis: Switching From Dry Ice to Gel Packs

For a brand shipping 100 refrigerated packages per week, here's the math:

That $140/week in direct coolant savings doesn't account for the additional savings from:

• Reduced dimensional weight — gel packs are lighter than equivalent dry ice, which can lower carrier charges
• No hazmat labeling cost — eliminates label materials and the compliance overhead of generating UN 1845 labels
• No compliance risk — zero chance of account suspension from labeling violations
• Simpler training — staff don't need dry ice handling training

The upfront investment is minimal. You need gel packs (which are reusable) and possibly insulated containers if you're not already using them. Most brands recoup the initial investment within the first 2–3 weeks of switching.

Frequently Asked Questions