We tested two dozen backpack coolers. These are our favorites Whether you're headed to the beach , a park, or the top of a mountain, a backpack cooler can make a cumbersome carry easier.

But when you will be gone for more than an hour or two, one cup isn’t enough. That’s when a backpack cooler becomes essential. These hands-free totes, such as the RTIC Backpack Cooler or the ...