I use the foldup Rav Power ones, something akin to this.
https://www.amazon.com …up&qid=1598529138&sr=8-20
When we are out and about, I will unfold this and lay it out on the vehicle windshield powering the charger with batteries in it, with the batteries/charger under one of the folds to keep it out of the sunlight.
If hiking, one can strap this to the backpack as well, there are usually loops, etc you can attach with carbiners.
Thank you TeamSpeed





Dopey looks so contented in the purple heather.






