I am not really concerned about the fish being in the bags that long because I am planning on packing them the same way that people that ship oversees do. I will put each fish in an individual bag, place a "Bag Buddies" tablet in each one and then fill the bag with oxygen, double bag it and place the bags in a box with styrofoam filling. About crossing the border, from what I know It is not a big deal if you contact the appropriate officials before hand and tell them you are taking fish across the border. Or you can simply conceal the box and not declare that you are transporting fish, many people have done it and have not had problems. I will call the appropriate officials and ask about the details involved. I will do this very soon, and let you know. Did you find out when he is planning on going to Michigan?