YETI | Hopper M20 Soft Backpack CoolerFor Anyone Looking for a Top Shelf Soft Sided Backpack Cooler with Superior Insulation & Cold Retention YETI Hopper M20 is HERE! Whether you are headed to the beach, a park, or the top of a mountain, a YETI Hopper Soft Backpack Cooler can make a cumbersome carry easier. Hard coolers do a great job keeping drinks and food cold, but even equipped with wheels, they are difficult to take to certain places, such as beaches that swallow them in the sand,