Go old school, Wicker Creel and wet grass or a scrap of burlap ! I've also used my day pack and a freezer pack in a ziploc when it got real hot.
cooler with ice, fill it up with drinks and lunch and when you start catching fish you have to prioritize on room, lunch always loses
. On a side note, don't know what the mercury level in your local fish is like but probably something to look in to if your wife is pregnant.