“Floppies” in hard-plastic cases were 5 1/4″ or 8″ that were actually floppy. I’m talking a paper-punch to cut a read/write notch so you could write the other side of the floppy. Never put one of those in your shirt pocket, let me tell you whatwe used to carry them through the snow to schoolyou kids get out of my yard! I’m talkin’ about 5 1″ or. 8″ floppy cases.”]
Source: https://gizmodo.com/a-floppy-disk-thats-safer-than-your-hard-drive-5084405