I've also used the Goal Zero brand but I only had 2 panels. They work good. Kept my camera and cell phone going while I was in Canada. Bare in mind we were out for 14 days at a time and taking a heap of pictures. If you're out for less than a week it would be much more sensible to just take a decent size powerbank and forget the solar charger.
Also, be aware if you're flying you have to take the powerbank in your carry on. They'll open your check in bag and throw it in the bin like mine....
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