Like Salmo, I use the Silver Horde "Katch Cooler" if that's what you mean?

I stuff sheets of "techni-ice" (basically blue ice) in one side, and fish in the other. Perfect for half day trips out on the sound. The whole thing (bag included) lives in one of my fish boxes. I prefer the blue-ice to real ice simply because I don't have to deal with water spills in my car on the way home.

THe downside is they are a pain to clean and dry properly, but it's manageable. I seem to go through one of these every 2 seasons, after about 2, they're grim enough that I spend the $15-$20 on a new one.