There was a similar post a couple months ago.
Best Products Sub $100 that you can get on amazon?!
Here was my submission, hopefully the links haven't changed.
I used my phone for Guthook/camera (and podcasts) so it was pretty much a necessity to be charged before I could leave town... so I made sure my wall-charger, powerbank, and phone were all quick-charge and it made a massive difference for me: I would hit town and put phone/powerbank on charge first thing, do my re-ration etc, then be able to hit the trail again within a few hours with full charge ... whereas I knew other folk who had to stay overnight when they didn't want to.
I got:
I think 2 ports is enough really, I would just charge the headtorch/ipod when I got the chance or a longer town stay. Ontrail I would kinda start running low if I used the phone a lot for 4 days, and have to be a bit conservy... there's likely better stuff now, but just fyi!