I never liked taking my original CDs, or any CDs at all for that matter, with me on a roadtrip or on holidays. CDs are fragile and tend to break pretty quickly, especially if kids are around. If they don’t break them they usually scratch the CDs into oblivion. I began to create backups of my CDs and take them with me on those trips which solved one problem. I still did not like carrying around dozens of CDs and decided to convert them into digital media and put them on my mp3 player instead.
The problem that I was facing now was that my mp3 player has a limited storage capacity of four Gigabytes. With audiobooks growing in size all the time it is not that unusual to encounter some that would use up to 500 Megabytes and more of space on that mp3 player.
I therefor came to the conclusion that the best way to prepare my audiobooks was to reduce their quality. While it naturally reduces the quality of the recording it does not reduce it that much in my opinion that you would stop enjoying the audiobook. The benefit of course is a reduced file size.