Hello, as the title suggests, I’m searching for a waterproof power bank and solar panel for an extended backpacking trip. There will be no access to ac power or vehicles, and the trip duration will be long enough that the power bank will need to be recharged with a solar panel setup. I figured that eventually the solar charger and power bank would encounter rain or an unexpected drop in a stream, which is why I am looking for a waterproof setup. I’ve read that most power banks with a built in solar panel are more or less useless, so I’m looking more for a separate solar panel of the folding variety. The power bank’s capacity should be around 20,000 mAh. Budget is around $400 for the pair. Thank you in advance for any info or suggestions.