Using those heat packs is just ignorant. As has been mentioned here, they reach a higher peak temp, which is more dangerous, and their duration is really only a few hours. They peak fast, high, and then fall fast.
The MINIMUM heat pack required for cold weather FedEx shipping is 40 hours. There are 60 hour and 72 hour heat packs as well. Those don't peak any higher than the 40's, they just have longer duration. They are actually great to use, they just weigh a bit more, and can affect your final package weight.
We cover heat pack use in the ShipYourReptiles Get Help section.
It isn't hard to find the right info on heat pack use, and very easy to do it correctly. A shame that this shipper did not.
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