I don't remember what the price was a decade ago, but something like a 60W folding panel these days often goes on sale for really cheap, like, under $2 a watt.

I don't remember what the price was a decade ago, but something like a 60W folding panel these days often goes on sale for really cheap, like, under $2 a watt. The backpacks with built in panels are still expensive because I'm guessing it's hard to find customers who want to be in direct sunlight long enough to get significant charge, while carrying a backpack.