Hey I don't know much about shipping....but dont fish being shipped are in the bags bewtween 24-48 hours?
Thiers also new bags that are apparently "breathable"
Good Luck but like mention bucket, battery powered air pump and prime and you will be set...a therometer too
Kordon breathers are usually only used for really small fish and fry as a rule because they are really thin compared to regular shipping bags and easily punctured by larger fish. In this case, they can't be used because you're talking about fish that are too robust for that kind of bag.