When I was a kid, our family had a Rubbermaid cooler. Back then, the brand sold a lot of the things, but these days, they've been largely displaced by coolers from Coleman and Igloo. You'll still find one or two Rubbermaids in the cooler aisle at Walmart, though. They look just like the one I grew up with, and a 48-quart "Ice Chest" model like the one I'm writing about now won't cost you any more than $20.
You shouldn't buy it. Like, the Rubbermaid Ice Chest doesn't have a lid latch or even a drain, which is just a baffling omission. Worse, it wasn't able to outperform a disposable Styrofoam cooler that I grabbed at my local grocery store for $4.
The weak performance stood in stark contrast to what you'll get if you spend a little more on the $45. That cooler held the cold about as well as I could have hoped for in my tests, even outperforming coolers like the and the that cost hundreds more. Nix your nostalgia for Rubbermaid and buy the Igloo MaxCold instead -- or stick with the Styrofoam and use the money you save on an extra six-pack.
Now, in fairness, the Ice Chest's poor performance seems to be less of a Rubbermaid thing and more of an overall cheap-cooler thing. Just look at the, which I picked up at Dick's Sporting Goods for $15.