60 hour heat packs for shipping by Priority 2-3 Day Mail?

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happy1892

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Hi. I am running low on 96 hour heat packs, but I have some 60 hour heat packs still. I am going to ship some mantises soon to California and other places. Would 60 hour heat packs last long enough for 2-3 Day Priority Mail?
 
Hi. I am running low on 96 hour heat packs, but I have some 60 hour heat packs still. I am going to ship some mantises soon to California and other places. Would 60 hour heat packs last long enough for 2-3 Day Priority Mail?
I would think so. I usually stick with 72 hour heat packs, but 96 are probably better.
 

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