Depending on the cooler bag you choose, your food can stay cold for hours or days. As a reference point, Coleman’s budget bag boasts that it can keep 30 cans cold for 24 hours. Of course, the quality of the insulation technology is important—with Yeti’s closed-cell foam, such as in the Yeti Hopper M30, leading the way—but size also matters. The bigger the bag, the more ice it can hold and, therefore, the longer your bag will have ice to keep your food cold.