This would be a good way of distributing older discs that are harder to find now, it'll be interesting to see if it becomes a trend with future 3.0 figures. (monamiibo.com)
Still, plain old discs are as secure as the mail. (lawyerist.com)
Cone cells in the retina each carry a stack of membranous discs: as they grow they shed older discs and generate new ones. (newscientist.com)