Which MP3?

How big is an audiobook? You'll need at least that much storage space on your player.

I have a MobiBlu Cube. It's less than an inch square, weighs less than an ounce, and holds 2GB. Is that enough storage? It has an equalizer with several presets for different kinds of music, and a setting you can customize to your preference, so you could add to the upper registers and mute the bass so it's just how you like it.

I would think many, if not most, MP3 players would have the same sort of equalizer setup, or at least a bass-treble control.

Mine has lanyard-style headphones so the whole thing hangs around your neck. The weight's not noticeable. It also has an FM radio. The only thing is, the smaller the player, the smaller the controls. It's a little tricky to press the right combination of buttons on this tiny thing... If you have large fingers, or your vision's not clear, it would be good to handle the player first to make sure you could operate it easily.