“This may be the most game-changing thing I've every bought on Amazon,” Menyes says. “It's so easy to keep in my bag in the summer, and it's super powerful. I've even used it as a backup battery charger in a pinch, and it works great for that, too.” This mini fan not only features two durable blades to keeps you cool no matter where you are, but it also has a built-in USB-C port that can keep your phone in the green when you’re traveling. It can be held in your hand or folded into a stand. And it has up to 19 hours of cooling time on a single charge.