Whether you are in an urban, suburban, or wilderness environment, you probably carry some form of electronic devices or equipment. If you carry items such as a Smartphone, a GPS, a camera, flashlight, or a small tablet, as part of your everyday carry (EDC), or as part of your get-home bag, bug-out bag, evacuation kit, or wilderness pack, you should have some way to recharge those devices. Some of your items may use batteries, which will need to be recharged as well.
The size and type of charger will depend on whether it is a daily trip, or extended excursion. The longer you are gone, the more reserve power you will require. Of course there are various types of devices available for this purpose. I will identify some that are quality products, perform as intended, and have worked well for my purposes.