if you're not opposed to using your already existing device, I suggest an app like ReadEra which uses multiple eBook formats.
if you're uncomfortable using google play to download it, there are also fantastic libre readers on fdroid and independent sites that will also work beautifully.
i just like ReadEra cause it has so much customizability. and its one less device to take with me on long journies.
and they will lose. because you can't stop the signal, Mal.