Description

UniHeat 48 Hour Heat Pack (Shipping Warmer)

The UniHeat 48 Hour Heat Pack (Shipping Warmer) sets a new standard for dependable overnight and 2-day shipping. Designed for consistent, controlled heat that lasts beyond 48 hours, it’s the ideal choice for reptiles, insects, tropical fish, and plants traveling through unpredictable weather or carrier delays.

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Why the UniHeat 48 Hour Heat Pack (Shipping Warmer) Matters

Even reliable carriers sometimes miss their overnight delivery window — and when live animals or temperature-sensitive items are in transit, cold exposure isn’t an option. The UniHeat 48 Hour warmer delivers a steady, dependable heat curve that protects your shipment for up to two full days, giving you a critical margin of safety when delivery times slip.

Engineered to bridge the gap between the 40HR and 60HR models, this pack provides the controlled activation of shorter warmers with the extended life of long-duration units, making it the go-to solution for overnight and 2-day shipping.

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How the UniHeat 48 Hour Heat Pack (Shipping Warmer) Performs in Transit

The 48HR pack activates within about 30–45 minutes, gradually reaching peak temperatures near 155°F (68.6°C) around the 12-hour mark. It maintains steady warmth in the 140–150°F (60–65°C) range for more than 24 hours before tapering slowly toward the end of its 48+ hour cycle.

This stable, gradual heat release helps prevent temperature spikes that can stress live animals, while ensuring boxes stay safely above critical cold thresholds throughout transit.

The red stripe marks the breathing side, where the air holes are located — always face this side toward open space in the box, not against walls or lids, to maintain airflow.

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Key Features

Extended Heat Duration

Delivers reliable warmth for 48+ hours — ideal for overnight or 2-day routes where timing and stability matter.

Stable Heat Curve

Smooth temperature rise and steady performance protect temperature-sensitive shipments during long transit times.

Fast Activation

Just open the outer wrapper and expose to air. Heating begins within about 20 minutes.

Compact Design

Measures 4″ × 5.5″ — fits easily into most insulated shipping boxes.

Safe & Eco-Friendly

Non-toxic, non-flammable, and biodegradable. Dispose with regular trash.

Optional Adhesive Backing

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

Case Quantity

120 pieces per master carton (individually wrapped).

*Actual heat duration and temperature may vary slightly depending on box insulation, ambient temperature, and shipment size. 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 this warmer inside a Styrofoam-lined or insulated box for best performance. Pair with a PhazeLock PCM 23 Gel Phase Pack to stabilize internal temperature if your shipment crosses multiple climates.

Gently flex the pack before use — it helps air get in and activates more evenly.

Before shipping, check current U.S. weather alerts to avoid unexpected temperature extremes or transit delays.

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Bottom Line

The UniHeat 48 Hour Heat Pack (Shipping Warmer) delivers peace of mind for overnight and 2-day shipments in unpredictable weather. It’s the best choice when your cargo can’t afford to wait — consistent, dependable, and built for real-world shipping conditions.

👉 Before you ship, review our Best Practices for Shipping Warmers to ensure reliable results every time.

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