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Trees, trails and waterfalls don’t have USB ports. Still, we need to bring our devices — mirrorless cameras, GoPros, plus-sized smartphones — when we venture outdoors. Before your next adventure, slip a portable power bank in your travel bag. They’re packable and rugged, so they won’t slow you down.
Editor's Note: Some of the power banks included in this roundup are lighting deals and may sell out. Act fast.