Anker Nano Power Bank (10,000mAh)

A pocket-sized battery with a built-in USB-C connector, so there is no cable to forget. It holds roughly two full phone charges and outputs 30W, quick enough to be useful during a short stop rather than overnight. It will charge a tablet slowly and a laptop barely at all. Light enough to carry daily without thinking about it, which is the difference between a power bank you use and one in a drawer.