Don't feed the fish for 24 hours before transporting, less food in means less waste out. Any fish safe container will work, consider a cooler to maintain temperature, I've seen plenty of large fish sold in the cheap styrofoam coolers at auctions. As long as you use 1/3 water, 2/3 air in a sealed container such as a fish bag, and fast for 24 hours before transport they will be fine for several hours.
I've bought & sold plenty of fish that have been bagged for 12+ hours, they have no problems as long as they are fasted & bagged properly. I've also had larger fish transported in coolers, you need to tape the lid down for larger fish, as they will jump & knock the lid off.