The Goal Zero solar panel I have is a 7 watt unit that’s not much smaller folded up than the 16W unit, and the GZ was considerably more $$. 16W is great for the small electronic gear you’d take on short hikes.

For my GZ Yeti 400, I have a 100W Renogy panel, not exactly portable, but lots more output if I need to set up in the backyard.