YETI Hopper M20 Backpack Soft Cooler

The YETI Hopper M20 Backpack Soft Cooler closes out this list as the best-performing soft cooler OutdoorGearLab has tested, holding contents at 40°F for 3.6 days and at 50°F for 4.0 days — figures that beat every other soft-sided cooler in this guide, including the RTIC 30 Can bag, despite carrying none of the rigid rotomolded walls that typically boost ice retention. Its backpack straps and MagShield magnetic closure make it genuinely hands-free to carry, a real advantage over shoulder-sling soft coolers on a hike to a lake or trailhead. At 21.3 quarts (36 cans) and 5.2 lb empty, it sits between the RTIC soft cooler and the hard coolers on this list in both capacity and weight, and its $325 price tag is a significant premium for a 20-liter-class soft cooler — more than double the RTIC 30 Can and within striking distance of several full-size hard coolers with far greater capacity. YETI backs it with a 3-year warranty, and it is not bear-resistance certified, a real limitation for backcountry use in bear country compared with the certified hard coolers ranked higher in this guide. For hikers, paddlers, and cyclists who need genuinely hands-free carry and the best ice retention available in a soft-sided format, the Hopper M20 is the clear pick among backpack coolers — its 9/10 Portability score trails only the RTIC soft cooler's raw weight advantage. It ranks 10th overall not because it's a weak product, but because its Capacity (2/10) and Value (3/10) scores can't compete with the hard coolers that dominate the top of this list; it's a specialist tool, and an excellent one, rather than an all-around cooler.