Phase Pack Winter Animal Shipping Guide

Shipping live animals in cold weather requires stable, reliable temperature control. The PhazeLock™ 23°C Gel Phase Pack winter animal shipping suggestions helps keep reptiles, amphibians, and other temperature-sensitive species safe by stabilizing heat levels throughout transit. This guide explains how to use Phase Pack correctly with UniHeat warmers, proper insulation, and safe packing methods.

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Why Proper Use of PhazeLock™ 23°C Gel Phase Pack Matters

PhazeLock™ 23°C Gel Phase Pack are designed to stabilize, not generate, heat. Each pack contains a phase change material that maintains a consistent 23 °C (73 °F) environment by absorbing or releasing energy as needed.

However, in cold conditions, a PhazePak™ alone isn’t enough—it will eventually cool to match its surroundings. Using a PhazeLock™ Gel Phase Pack without a heat source in winter can allow it to solidify, keeping the temperature too low for live-animal shipments.

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Best Practices for PhazeLock™ 23°C Gel Phase Pack Winter Animal Shipping

1. Always Use with a Shipping Warmer

Pair your Phase Pack with a long-lasting warmer such as a UniHeat 48 HR or 72 HR heat pack.
The warmer provides gentle radiant heat, and the Phase Pack stabilizes that warmth to prevent overheating or temperature swings. This combination is the foundation of safe PhazeLock™ 23°C Gel Phase Pack winter animal shipping.

2. Precondition Before Use

Store Phase Pack at room temperature (68–75 °F / 20–24 °C) for at least 24 hours before use.

• Do not freeze them in winter.

• Do not overheat them — they only need to be room temperature, not hot.

If you’re unsure about storage temperature, refer to the official USDA Live Animal Shipping Guidelines.

3. Placement Inside the Box

• Place the shipping warmer to one side near the bottom of the insulated box—never directly beneath or touching the animal container.

• Position the Phase Pack close to the heat pack but separated by a layer of paper or packing material so it can buffer and regulate the heat effectively.

• The PhazePak™ and warmer should never touch the animal container directly.

• All voids must be completely filled with packing material to prevent cold air pockets and maintain even heat.

• Never use a box smaller than 12 × 9 × 6 inches for a single animal. Smaller boxes limit airflow and reduce heat control.

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Visual Example: Proper Winter Animal Shipping Setup

Example of a proper PhazeLock™ 23°C Gel Phase Pack winter animal shipping setup using a UniHeat warmer, cloth bag, and packing material filling all voids.

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Insulation and Box Quality

A thick insulated box (¾″–1″ walls) is essential for maintaining steady temperatures. Inferior insulation cancels out the stabilizing effect of the Phase Pack.
Find quality shipping materials and insulated boxes at TSK Supply Shipping Materials.

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Common Mistakes to Avoid

• ❌ Using only a Phase Pack in cold weather

• ❌ Freezing or refrigerating the pack before shipment

• ❌ Allowing the warmer or Phase Pack to touch the animal container

• ❌ Leaving air gaps inside the box

• ❌ Using poorly insulated boxes

• ❌ Using boxes smaller than 12 × 9 × 6 inches

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Cold Weather Warning

When shipping in below-freezing conditions, even the best setup may not be enough to maintain safe internal temperatures.
If temperatures are extreme along your route, it’s best to delay shipping until conditions improve. A short delay is better than risking your animal’s health.

For reference, review:

• FedEx Live Animal Shipping Policies

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Quick Reference: Seasonal Guidelines

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Summary

PhazeLock™ 23°C Gel Phase Pack are advanced temperature stabilizers designed for winter animal shipping.
For best results:

• Pair with a 48 HR or 72 HR UniHeat warmer.

• Place the Phase Pack close to the warmer but separated by paper to buffer heat.

• Never allow direct contact with the animal container.

• Fill all voids completely with packing material.

• Use a well-insulated box no smaller than 12 × 9 × 6 inches.

• In extreme cold, delay shipping until it’s safe.

Note: These are general guidelines. Always consult an experienced live-animal shipper for species-specific advice and additional safety recommendations.