Have you ever noticed that most of the lids of coolers are hollow.

So last night I took 2 and drilled small holes on the underside
of the lids just to fit a spray foam tube in and filled the lids with
foam insulation.

Now then the bottoms of most of our have polystyrene or something 
of the sort.

Got some nice warm days upcoming to try this out. If it doesn't wok any
better I guess I'm going to purchase an Rtic cooler.