[PLUG] Articles on MP3 player usability?

[Richard Owlett]

I'm an tri-focal wearing octogenarian with some auditory issues.
I wish to listen conveniently to the KJV Bible and/or commentaries.
A suitable Bible in MP3 format whose zipped format is ~1.2 GB with 
reading time of 85 hours. The commentaries of interest would likely be 
~10 hours per set.

Smartphones are *NOT* a possibility.

I'm looking for the functionality of a 60's era pocket cassette player.
I have never seen an MP3 player (friends all tote smartphones).
Ads on web are useless. All the MP3 player articles I found were focused 
on tech behind the MP3 format and various descriptions of fidelity 
versus bit rate (was an analog focused E.E. student a half-century ago ;)

Suggested articles dealing with usability issues?
Can I at least have the Bible and commentaries in different directories?
How much can be stored on the device itself (had assumed flash drives 
would be needed)?
TIA