I kinda agree with both Tim and Yardboy,,(hows that for not fallin of the fence ? LOL)
I believe frags ship better without being "mounted" as i've seen with SPS in my experience and some other local club members. I used to transport my frags to club meeting with them mounted on
frag plugs(Cyberchief sells these kind) and the plug is mounted into a small piece of styrofoam. after seeing other guys stuff, some of it loose in a bag. i now go the loose inna bag way.
Although long range shipping, 'specially with softies and the likes, i think it would be better to go the rubber banded to a styro "float" as to keep the coral from getting crushed in a corner of a bag, and kind of free floating with hopefully less contact with the shipping bag.
I think in Aussies situation, temperature control is prob the main concern here, and how they are in the bag not so important as far as how it's in the bag.
Tim's concern with air in the bag probably relates to around the world .long term shipping , with a little bit of box tossing involved(we all know it happens)
In a road trip environment ,i think Aussie , like most of use will travel/pack our stuff a little more carefully, and not treat the container with the goodies in it , like the dudes at the airport conveyor belt.
hot/cold packs(based on your temps there Aussie) in the cooler,making sure they do not touch any of the bags would be the way to go IMO.
No Mad Max drivin, keepin the auto of choice on four wheels most of the time , to keep the sloshing to a minimum, and keep the temp from fluccuating.
(i fill my cooler with tank water in addition to the bagged stuff, cover it with a towel ,hot/cold packs taped to the lid,and a towel over the cooler while in the truck to help stabilize temps)
6-8 hrs is not that long, if temp is kept decent,,
When i was on the other side of a LFS counter, i used to remember stuff that came from the other side of the planet(that got detained/went awol for a while at stops )arrive in better condition then stuff from Fla.,that came straight thru.