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Old 09-28-2011, 06:05 PM   #3
Nanci
I use boxes with 3/4 inch insulation. You can buy boxes with 1/2 inch insulation, but it doesn't save much. You might think that the insulation is for, insulating, but really it is to protect your box from crushing. When you send in your test package, the FedEx testing center puts it in a machine that attempts to crush it with several hundred pounds of pressure. The thicker insulation is an important safety measure.