How Does A 72 Hour Heat Pack Work
The 72 hour heat pack will activate in approximately 30-45 minutes and reach its peak surface temperature of 115°F (46°C) in approximately 4 hours. The temperature of the heat pack will then gradually decrease and maintain at approximately 100°F (38°C) for majority of of its operational life.
One 72 hour heat pack will increase the temperature of a 1 cubic foot insulated box by approximately 15 degrees. For every additional heat pack that you use the temperature will raise an additional 15 degrees. Ideally the 72 hour heat pack is used for priority or express shpping times of 2-3 days (with out delays). They are not recommended for shipping options of 3+ days of transit.
source: jungle jewel exotics
Here’s one of the small box that required a heat pack. I would normally set up the heat pack this way or on top of the lid of the box. Papers will fill the space in between the plant and the heat pack.
(7x7x6 usps box priority mail with a heat pack)
(Usps