I considered getting a portable solar panel and Anker was on the short list for sure. Never ended up pulling the trigger on any though.
What's your oldest Anker product you still use today?
Just found this pic on time hop of the Old Astro E4 being used as intended. Mobile charging at its best 
She loves to take her iPad to the loo
Astro 3E from 2013 o.O
My Astro E3 came with us on holiday to Spain, still going strong all these years later.
Was part of a much bigger haul that made the trip.