Portable power is a mainstream concept these days, with a multitude of chargers and battery packs to keep electronic devices going for days. But the $100 Powerall is the undisputed king. It’s about the size of two cigarette packets and holds enough juice to jumpstart 20 vehicles on a full charge, which can come from a wall socket or 12v battery outlet. You get a pair of heavy-duty jumpstart cables in the box, and the Powerall also has two USB ports that can quickly charge separate devices—such as a phone and camera. And there’s an ultrabright LED flashlight with an SOS signal function that can run for 120 hours. If you ride further than your local café, one day you’ll be glad you had one of these in your pocket or pannier