No heat pack. Use a well insulated box and make sure the snake is toasty warm when it's put into the box, but don't add any extra heat. Good insulation will keep it from getting too chilly too fast...but even a few hours at those colder temperatures (If it's even exposed to them long enough to get that cold) are not as dangerous to the snake as the risk of overheating due to a heat pack in a box on a hot day. Reptiles, in general, tolerate cooler temperatures FAR better than temperatures that are too warm.
Temperature guidelines from SYR: http://shipyourreptiles.com/en/get-h...ds#question-15
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