Anker 20,000mAh power bank with 65W USB-C Power Delivery output, which is enough to charge a laptop at close to full speed rather than just trickling it along. It has two USB-C ports and one USB-A, so you can top up a phone, tablet and laptop together, and the capacity is right at the limit airlines allow in carry-on luggage, making it a genuinely useful travel companion. I bought two for a long trip and only ever needed one, so this unit has been through fewer than ten full cycles. It holds its charge for weeks when idle and shows no swelling, heat or port wear. Included are the original braided USB-C cable, the travel pouch and the box. This is well below the usual retail price for something effectively unused. Pickup in Brickell, Miami, most days after work.