[cee]

All good advice. The only thing I would add is I either float thin-branched delicate SPS on styrofoam or wrap it in a piece of cut-up bag to keep it from banging against the shipping bag walls and/or frag plug (if the glue joint fails) and busting up. They usually arrive intact and stay submerged in water in spite of the box getting turned in all different directions while being transported. Also, always provide some insulation between the heat/cold pack and the frag bags to prevent the water from coming into direct contact with the heat/cold pack and causing large temperature fluctuations.

Dave