Malibu Cooler Liner???

I saw a few weeks back about a cooler liner for built in coolers on boats. My cooler will not hold ice worth crap and now I cant find that post ro a website that sells a liner for coolers that you can take out and put back in. Anyone have any of these soft coolers that you can put in their boat cooler?

http://www.bakesonline.com/detail.aspx?ID=1103

These cooler bags are great. Load them up at home & take them to the boat full of ice & drinks, and just put it in the cooler space under the seat. Then haul out all the garbage in it when you leave the boat.
But they don't keep ice worth a dam. Last year I started freezing all our bottled water. When I load the cooler, I use frozen water bottles instead of ice. Now I have cold water, drinks & a lot less mess.

I find that the cooler bags vary a great deal with their ability to keep ice from melting. I grabbed one from K-mart for $15 and the ice melted pretty fast. Now I'm using one from http://www.polarbearcoolers.com and it keeps the ice loooong time, so I'm stoked with. I also just noticed that they have bag coolers at Costco for $7. They aren't as thick as my Polar Bear, so I doubt they retain ice for long, but for $7 it seems like it's worth a try!

Is there any way to insulate the outside of your factory cooler? I noticed that mine has 3-4 inches of what looks like spray foam around it. It holds ice pretty well. I dont like to use it though because its too small. We usually put a few bags of chips or other stuff and use it like dry storage. It works out best for me to just fill up a full size icechest and we put that in the boat..works great! doubles as a table w/cupholders. We also move it around like ballast too.

The cooler bag is great, but it doesnt drain. I solved that problem by putting a series of brass grommets on the bottom to allow the water to drain, but the ice to stay. We'll see how it holds ice this summer. I will try to post pics tonight.