Not long ago, a backpack was a simple device, one made for carrying books, small personal items, and other stuff. Then, something changed, and backpacks started evolving. Now it's not at all uncommon to find a backpack that can actually charge the electronic devices within it. One such model is the Energi+ Backpack from TYLT, which I've been using for the past couple of weeks. It's not the first backpack equipped with a battery, but is it the best?
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