I buy cheap paperbacks and let them fall apart. No matter the quality of the book steam will damage it eventually. The paper will swell and mould develop. I have probably replaced my favourite bath books a couple of times. I am a bibliophage rather than a bibliophile, so the physical book is not as important to me, but there are certain books which have a sentimental association which I would never bring into the bath.

I read on my phone sometimes. It's a piece of crap Xiomi with a cracked screen so I'm not bothered if I kill it.