One of the perennial issues with portable CD players has been their bulky size relative to digital streaming devices, but Monodeal's MD-102 personal CD player is about as compact as you can get.

Anyone who owned a later portable CD player will remember the ability to fit more songs on a CD-R disc with MP3s, and the DM13 supports those types of discs with MP3, FLAC, WAV, AAC, and WMA audio ...