My husband is an avid reader, so an ereader would be a light way for him to carry lots of books. Likewise, DH and DS love their video games. We're not going to purchase one to dedicate for that purpose though. I have a tablet that includes an ereader and some games, but I suspect we'd dedicate that to information gathering in an emergency.

We have a little 1W Solar Planel that would probably work well to charge the tablet. Haven't tried it but we did use it to power the truck radio during an all-day picnic last year and it worked great.