Agreed with Jorge and MAP.....they work SO good, sometimes the meat will continue to cook!
We don't hold meats in our Cambro at comps anymore. We use pizza bags wrapped in a fleece blanket (AFTER venting the meats first).
But, to the question: No need to wrap meats in towels. Just put em in a pan and slide em into the cambro. Just make sure you vent off the heat a bit first or you'll steam everything inside.
Big JT's Smokin' BBQ Competition Team
"The path was worn and slippery. My foot slipped from underneath me, knocking the other out of the way, but I recovered and said to myself, 'It's a slip and not a fall.'"