I have a Sony E Reader, a similar, but not quite as adaptable device, and its been wonderful on Belize trips: not having to carry several books each trip, especially large print ones, which tend to be bigger dimensionally also, speaks for itself, and a bonus feature to me is that I always have several classics and a few non fiction works for time in between current novels.
Recent Belize reads include The Forgotten Man, Moby Dick, Treasure Island and Up From Slavery, as well as Baldacci, Bell, Flynn and DeMille.
For your kids or grandkids, to encourage them to read would be amongst the greatest gifts you could give.