Product Comparison

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90 The YETI Hopper M20 is the best-in-class backpack cooler I’ve tested. It’s by far the most comfortable and it also has the best ice retention. But it’s also the most expensive, and depending on your use-case, you might not need something as robust as the Hopper M20. If you want the best of the best, get the YETI backpack cooler. But if your budget is tight, look at Icemule.
90 The YETI Tundra 45 is the best cooler for ice retention and insulation of all the coolers I tested. It’s my personal favorite, too, though other brands like RTIC and Igloo can carry a similar amount and have the same versatility. Technically speaking, though—the YETI is the best. 
85 The Icemule Pro XL Cooler is my favorite backpack cooler for watersports. For land-based activities like hikes and scrambling over rocks, I preferred the YETI Hopper M20 because of its harder shell. The Icemule Pro XL cooler didn’t perform as well as the YETI did in my ice test, but it outperformed the other four coolers I tested, and the value-for-money is exceptional.
83 The insulation for the Icemule Pro was nearly as powerful as the YETI Hopper, which I didn’t expect. And the ergonomic design and loads of padding on the back and shoulders makes this an easy cooler to travel with all day. This is the best value for money backpack cooler I’ve found.