Check out the rugged Pelican 30 QT Elite cooler. Heavy-duty materials offer extreme ice retention as built-in bottle opener and cup holders add extra touches.
I figure with a bit of ingenuity that I can add side shelves(folded) without increasing the overall dimensions, and keep the handles clear, using cutouts in the shelves.
I have a fair amount of 1/4" clear polycarbinate (Lexan) sheet.
...Next step; is to accurately measure the cooler in the handle area(s)... verify the sides are mirror images & make a sketch.
Letting the shelf idea marinate in the cerebral slush for a bit; I'll likely set the cooler in the den and meditate on it for a while, over the weekend...
Right now I'm thinking black 3M VHB tape to attach the hinges...(works fine to hinge moderate sized solar panels together, with piano hinges)...