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I found a tiny power bank that charges two devices at once - for under $25
The Voltme Hypercore 10K power bank has a 10K power capacity and sleek, pocket-friendly design.
The corners are also rounded and soft, so there's nothing on the power bank to dig into your skin or burst a hole in the side of a backpack -- something I've had happen on a multi-day hike. That expensive, waterproof power bank now lies somewhere in the Brecon Beacon hills in South Wales. On the front of the unit is a four-LED power indicator and a button for activating it and turning on low-power mode so you can keep your smartwatch, earbuds, or fitness tracker charged and ready for action.
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