I live in an area with reasonably cold weathers (daytime temperatures in the high teens fahrenheit) but since I don't have a car I take buses and trains to get around. This matters because when I get good fish I go to a place about an hour away (by a train and bus) and have done so only during autumn/spring when it's cool but not freezing, using a cooler to carry the seafood back.
So my question is: how would I do this now? I'm pretty sure I need a cooler since I'll be spending 20-30 minutes on heated public transport. But should I put ice in it or not, since I'll be spending 20-30 minutes in well-below-freezing temperatures? Not a life-or-death question to be sure, but I'm interested in other thoughts. Maybe use wet newspaper or something? I'll be buying a variety of stuff fish, clams, shrimp, mussels.
Merry christmas, too.