I like your idea about the ice chest as a carrying case for the penguin. I really like being able to transform cases into on stage props. I carry my bear in a large yellow trash can with wheels. The raccoon could use an aluminum can.
However, I can't fly with a trash can. I also don't like paying extra for weight when the Axtell puppets are so light themselves. Does anyone recommend a case (with wheels) that is lightweight and protective? It doesn't have to be foamlined for my soft or latex puppets. I think the maximum length + width + height is 63 inches.