Question

I like to re-read good stories.  I save favorite books and will read them again and again.  I also do the same with fanfics.  However, I print them out on paper so I can take them along anywhere or read in bed.  The problem is I am finding myself swamped with files folders stuffed and piled high with paper.  I feel fairly confident that many of you read certain stories over and over as well.  

My question is, if you are saving favorite stories, what type of media are you using?  Paper, laptops, discs, whatever.  I don't even begin to know what to list and am interested in hearing your solutions to the problem.