I have a 2008 2820xl with fish box in the back, i do not believe the fish box is insulated, i use it to store cleaning supplies and other things, i use one of the trays to store things and have drilled a hole in the bottom to keep it dry. the other one I put my frozen bait in to defrost, works well. the dealer i boat my boat from builds custom coolers/live wells/seats. The one he put on my boat has a live well in the back with 4 storage trays for tackle, 4 rock launchers, the front has a seat for two with an insulated cooler under the seat that drains overboard. I was in the keys fishing a couple of weeks ago and put (4) 25lb blocks of ice in the cooler on sunday and used them through tuesday before I needed to replace them.