YETI Hopper M20 Backpack Soft Cooler

The YETI Hopper M20 Backpack Soft Cooler is the top-performing soft cooler OutdoorGearLab has tested, holding contents at 40°F for 3.6 days and at 50°F for 4.0 days—outpacing every other soft-sided cooler on this list, including RTIC Ultra-Tough Soft Cooler, despite lacking rigid rotomolded walls. Its backpack straps and MagShield magnetic closure enable hands-free carry, a real edge over shoulder-sling soft coolers on hikes. With a 21.3-quart capacity (36 cans) and 5.2 lb empty weight, it sits between the RTIC soft cooler and hard coolers in size and heft, but its $325 price is more than double the RTIC's and nears full-size hard coolers. YETI provides a 3-year warranty, yet it lacks bear-resistance certification, limiting backcountry use compared to certified hard coolers ranked higher. For hikers needing hands-free portability with the best soft-sided ice retention, it scores 9/10 Portability, just behind the RTIC's weight advantage.