Well, that's the parents case though, as that wasn't really much of a problem people had.

"Oh this random place I happen to be is a perfect place to read, if only I had my library with me to pick a book".

If people know they'll be traveling, they pack a few books to have with them (or buy at the airport). If they're commuting (e.g. to work on a train or long bus ride) then they bring along the book they are reading at that point in time. But usually they just read at their house/study/office.

As for casual reading, there's always tons of stuff on the web.