What powerbank do you use on hikes?

I’m looking to purchase a power bank to charge a couple phones if need be. I don’t really ever go backpacking or on long hikes but I’d like something that can get me by 4 days or so on limited phone use, but mostly as an emergency powerbank if something bad happened.

I was looking into the Nestout line, as they seem rugged, but figured I’d ask here first.