Do you have experience with portable solar chargers for phone?

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I find many interesting discussions on this platform and could spend a lot of time "chatting" here with many of you. As you know from my previous discussions, I like to explore alternatives to our current polluting energy sources. But since I am just a small fish, I cannot invest in my own solar powered house (yet). I just have to stay put and keep paying my fossil fuel energy bill to some large corporation. However, I like new gadgets and stuff. I also like outdoors, camping, taking pics, getting "lost". So I was wondering, with approaching spring, does any of you have experience with portable solar panels - only small size to charge my phone and my camera? Are they worth it? Are they resistant enough to stay overnight in my humid backpack somewhere in the camp? I saw this article listing a couple of them. It says pretty good things, and seems pretty honest to me. But of course, the real users experience is more precious. :) Tell me yours, if you can! Thank you.