Sometime larger fish can experience some damage during transport from bumping into the walls when the vehicle make turns at speed.
I saw that once with a LMB deliver, where some of the LMB actually had broken lower jaws at the front most area. Fish guy said it was due to transport.
If that was really true, then maybe you'd want some kind of internal netting to prevent impact with the walls.
However, if others like FIH, have not had this issue, then disregard my comment.
Don't disregard what you posted, you're right! A big cooler would probably only safely carry a few larger fish, and if I was going to carry multiple RBT, or spiny fish, then I would go with O2 filled bags too. Carrying fingerlings, shiners, etc. would be fine in a cooler. I'm picking up 10 lbs of FHM next week, and will use the cooler for that 3 hour trip.
