heat pack

I wanted to ask what people thought about related to the temperatures of when to use a heat pack, cold pack, and when not to use one. I'm under the assumption that temperatures will drop overnight during transit and therefore even if I'm shipping from a location thats 80F to another location...

I was researching coral shipping and temperatures and so on and came across this older thread: https://www.reef2reef.com/threads/heat-pack-study.96954/ It seems to be the only one I've seen with data on temperatures over several hours in the cold simulating shipping. I would love to see any and...

Happy New Years Eve guys! I recently shipped some corals to my friend as a Christmas gift using the UniHeat 40 hours pad and a styrofoam box. My friend told me that when he received the box. The water was ice cold and the heat pack was not working at all. Does it happen to you guys too? Is...