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For shipments that need dependable warmth over shorter routes, the UniHeat 40 Hour Heat Pack delivers consistent, reliable heat for up to 40 hours. It’s a perfect choice for overnight or 2-day shipping, providing gentle, sustained warmth to protect tropical plants, reptiles, and perishable items.
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The UniHeat 40 Hour Heat Pack is designed for shipments that need dependable warmth over short transit times. Delivering consistent heat for up to 40 hours, it’s ideal for overnight and 2-day shipping where temperature stability matters most.
Commonly used for shipping tropical plants, reptiles, baby chicks, fish, and other temperature-sensitive items, this heat pack helps protect your shipment from cold exposure during transit.
Compact and easy to activate, this heat pack is built for fast-moving shipments and short-distance routes. Once exposed to air, it gradually warms and maintains a steady temperature throughout the journey—without sudden spikes.
The UniHeat 40 Hour Heat Pack typically reaches peak temperature within 30–40 minutes after activation. For best performance, allow the pack to fully warm before placing it inside your insulated shipping box.
To avoid overheating, use only one heat pack per shipment. Proper insulation and placement ensure even heat distribution and consistent results.
If your shipment requires longer protection, upgrade to the 72 Hour Heat Pack, which offers extended warmth while maintaining the same trusted UniHeat performance.
Many standard heat packs provide warmth for only a few hours, increasing the risk of temperature drops mid-shipment. The UniHeat 40 Hour Heat Pack delivers long-lasting, consistent heat—helping protect shipments for the full duration of transit.
UniHeat packs are engineered to maintain a stable average temperature, reducing harmful fluctuations inside the shipping box. Their higher peak temperature provides additional protection for sensitive contents during cold weather shipping.
Activation is simple: remove the pack from its outer packaging, expose it to air, and place it inside your shipping box with proper insulation. No pre-heating or additional equipment is required.
When combined with proper insulation, the UniHeat 40 Hour Heat Pack performs reliably—even during cooler months. For longer routes or cross-country deliveries, consider our 96 Hour Heat Pack for extended temperature protection.
To prevent cold damage after delivery, bring your package indoors as soon as it arrives.
How do I activate the UniHeat 40 Hour Heat Pack?
Simply remove the pack from its outer packaging and expose it to air. It will begin warming immediately and typically reaches peak temperature within 30–40 minutes.
How long does the 40 Hour Heat Pack stay warm?
It provides consistent heat for up to 40 hours, making it suitable for overnight and 2-day shipping.
Can I use more than one heat pack per shipment?
Using one heat pack per shipment is recommended to maintain safe temperature levels and avoid overheating.
Is this heat pack reusable?
No. UniHeat heat packs are single-use and should be discarded after use.
What if my shipment takes longer than 40 hours?
For longer transit times, choose the 72 Hour or 96 Hour UniHeat Heat Packs.
Can heat packs get wet?
No. Exposure to water will permanently deactivate the heat pack. Keep it dry at all times.
Looking for the right option? Browse all UniHeat Shipping Heat Packs to compare durations and shipping use cases.
