It was mentioned above and looks like it'd be a good fit. An ounce and change heavier than my old solarpad pro, but potentially a bit more durable and the LED showing charge level is nice to get a feel for how it'll do at different times of the day or light clouds etc.

It's actually very cheap on Amazon US now ($19). Sunpower makes some of the best flexible mono solar cells, so that's a plus - they're the go to for larger marine builds iirc.