Smartest decision on price, and reliability, etc when it comes to a portable solar power bank?

Currently houseless. & living in a tent. I currently am (when I’m able to) use fast food restaurants to charge my phone.

One thing that I’d be ecstatic to own and call my own is a solar powered power bank. I don’t have the money to buy at the moment.. but once I do earn enough, I want to make sure I am throughly informed and positive the selection i decide is the best for my buck as they say.

(Any other options or suggestions are more than welcome!🙏🏼)