The YETI Hopper Flip 12 is the better default because it keeps the format simple. YETI lists 24 cans only, 7.0 kilograms of ice only, a 1.5-kilogram empty weight, and 32.1 W by 25.4 D by 29.2 H centimeter dimensions. Its wide-mouth opening, Hydrolok zipper, Coldcell insulation, Dryhide shell, and carry handle form a compact package for a shared lunch, short beach stop, car picnic, or small tailgate. The modest footprint is the deciding benefit: it asks less of the trunk, the boat deck, or the person carrying it.
The YETI Hopper M20 Backpack Cooler is the right alternative, not a lesser one. YETI lists 36 cans only, 10.0 kilograms of ice only, a 2.5-kilogram empty weight, and 46.0 W by 25.1 D by 46.0 H centimeter dimensions. Its padded backpack straps and MagShield Access opening change the routine. Pick it when a walk from parking to shore, a campsite, or an event makes hands-free carry useful, and when the extra published capacity makes the larger shell worthwhile. It is less convenient as a compact grab-and-go cooler precisely because it is built to carry more.
Neither result is a live ice-retention test, a price comparison, or a promise about every food-and-ice load. Check the current version, closure directions, included accessories, and the route from car to destination. For most people who need a capable soft cooler without turning every outing into a hauling job, the Flip 12 is the cleaner starting point.