I picked up my iPod Touch a few days ago and it's amazing how tiny the screen feels now (probably because I use a 5.5" LG G3 these days). To the iPods credit though it's still actually working great I remember being worried that the battery would be destroyed in a year and yet it's still going.
I kind of want to obtain an old 3.5" iPod Touch--the newest, thinnest version at that size. Because that is THE smallest iOS device ever made! Maybe the smallest that will ever BE made (not counting Watch OS)? Now everything's at least 4". My old 3.5" iPhone 4 seems like more fun now that it feels SO tiny. An iPod would feel even tinier.
I have that model. 8GB (smallest in memory, too!) iPod touch 4th gen. Next to my iPhone 6 or the 5 before it it's pretty ridiculously small.