I use the same method Shadowramy showed me with the addition of using clear packing tape around the seams on the inside of the styrofoam box and all the way around the outside to help keep the seal and to help keep it all together in the event of a crush. I wrap the heat pack in a double layer of butcher paper and never use more than one pack - it will burn the coral since almost none of the heat escapes the tightly sealed container.
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