Nano Power Bank

The Nano's appeal is honest: 10,000 mAh with a USB-C cable molded into the body, so the one item most likely to fray or go missing in a pack is no longer a separate item, and 30W input means a lunch stop in town puts a real dent in it. For a phone, a watch, and a headlamp over four or five days, it is enough. The problems are weight and math. At 215 grams it is heavy for its capacity, and the integrated cable is a single point of failure - when that stub wears out, the whole pack is done, because there is nothing to swap. Rated capacity is cell capacity, not delivered energy; after conversion losses, expect roughly 6,000 to 6,500 mAh actually reaching your phone, which is one and a half modern phone charges, not two. At its list price this is a convenience purchase, not a capacity one.