Name a device or technology that was ubiquitous when you were a kid but is all but gone now. I'll take an easy one so nobody else does: the diskette. I used these for my school projects until probably 6th grade when I received my first flash drive. I do have experience with the actually floppy disks, but mostly because of my fascination with old technology.
Look in the comments to avoid duplicating somebody's answer, and try and stay away from the obvious ones!