Description

UniHeat 120 Hour Heat Pack (Shipping Warmer)

The UniHeat 120 Hour Heat Pack (Shipping Warmer) is the longest-lasting model in the UniHeat line — delivering up to five full days of controlled, reliable warmth. Designed for extended or delayed shipments, it’s ideal for protecting plants, flowers, and other temperature-sensitive cargo from freezing or cold damage.

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Why the UniHeat 120 Hour Heat Pack (Shipping Warmer) Matters

When standard-duration warmers can’t go the distance, the UniHeat 120 Hour warmer steps in. It’s specifically built for multi-day ground shipments, international deliveries, and cold-weather transport where consistent heat output is essential.

This pack helps maintain a stable temperature inside insulated boxes, reducing the risk of freeze damage to sensitive products and providing extra assurance when delays happen in transit.

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How the UniHeat 120 Hour Heat Pack (Shipping Warmer) Performs in Transit

Once activated by air exposure, the warmer begins heating within 30–45 minutes. It gradually rises to a peak temperature of around 145–150°F (63–66°C) within the first 12 hours.

It then maintains a steady warmth between 120–130°F (49–54°C) for most of its 120-hour duration before cooling gradually over the final hours. By the fifth day, it tapers near 85°F, ensuring gentle, reliable heat through the end of shipping.

The red stripe marks the breathing side, where the air holes are located. Always position this side toward open air space inside the box — not against the walls or lid — to maintain even airflow and consistent performance.

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Key Features

Longest Duration

Provides up to 120 hours (5 days) of stable, reliable heat — perfect for long-distance or international shipping routes.

Smooth, Controlled Heat

Delivers steady warmth for plants, flowers, and other temperature-sensitive cargo without overheating.

Optional Adhesive Backing

Some packs include a peel-and-stick adhesive backing for secure placement and even heat distribution inside the box.

Larger Size

Measures 7.8″ × 6.4″, offering broad heat coverage for larger or multi-item shipments.

Safe & Eco-Friendly

Non-toxic, non-flammable, and biodegradable. Dispose of safely with household waste.

Case Quantity

50 pieces per master carton, individually sealed for freshness and ease of use.

*Performance may vary depending on insulation, box size, and ambient temperature. This product is intended for general temperature maintenance during shipping. Users are responsible for determining suitability for their specific application.

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Pro Packing Tip

Use the 120 Hour heat pack (Shipping Warmer) inside a Styrofoam-lined or insulated shipping box. For even better results, pair it with a PhazeLock PCM 23 Gel Phase Pack to help buffer against sudden temperature changes.

Gently flex the pack before sealing your box to promote airflow and ensure full activation.

Check current U.S. weather alerts before shipping to plan around extreme cold or transit delays.

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Bottom Line

The UniHeat 120 Hour Heat Pack (Shipping Warmer) provides unmatched endurance for the longest or most unpredictable shipping routes. Whether you’re sending plants, flowers, or other cold-sensitive cargo, this pack delivers safe, steady warmth for up to five days.

👉 Before shipping, review our Best Practices for Shipping Warmers to ensure safe and effective use.

Order today — usually ships same day on orders placed before 12PM.