There are a number of hazards that can kill electronic products (water, impact). We want to take a few ebooks with us (i.e. plant & animal identification, directions, trails info, etc).
Assume non-DRM ebooks. While it is possible to purchase one copy and share it between multiple devices, there may be legal issues.
I am thinking either a micro SD card or thumb drive, would be optimal but I don't know.
Short of having copies of everything on every device, what is the storage medium that will be least likely to fail and most transferable between similar devices?