Cool mp3 players

Soo i have stumbled upon a reel witch i cannot find anymore but a dude had a mp3 player which was round and small and hanged it on his jeans with a carabenier and i was thinking what small small mp3 players could i use and also hang on a carabenier on my jeans caise i find it looking good and practical (there was also this cylindrical one also really small)