I used to wrap them in a piece of cardboard, tape closed and dispose. But I buy my blades in the 5-pack refills and they come in a round plastic container. Once I used up all the blades in the first pack, I began using the empty containers to put the used blades into for disposal. I mark the container "used blades" (it holds about 7 or 8 used blades), then I just dispose of that, easy peasy and safe!