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I virtually always use gel packs with every shipment, no matter the temps. I have huge three pound packs for very cold and hot weather. I can use them frozen, room temp, or refrigerated. I also have a medium size for milder weather conditions. The gel packs act as a heat sink and stabilize the temp in the box, keeping it from rapid temp changes, holding your heating or cooling for a longer time.
Frozen packs, except the huge ones, only stay frozen for a few hours, but that gets your shipment out of the hot afternoon drop off period and into the cooler evening in Memphis. After thawing, they still stabilize the temps.
I like to put them in ziplocks just in case they leak. If room temp or cooled, that is enough. If frozen, I wrap them in newspaper. I do not place a snake directly on a frozen gel pack!
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