FWIW - I used this last year:
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And it worked much better than I expected. The carabiners were useless, but I used a little cordage to tie loops in the panel's eyelets and then ran my backpacks top strap through the loops to secure it. I was hiking NOBO, and I had the panel plugged into my Nitecore battery. I never had to charge the battery anywhere other than the panel the whole trip.?
