Well, QBF, I can't nail down your logo, partly because I can't remember them either, but I used to use carbon paper repetitively like that, though I never counted. I just used it 'til it was too hard to read the copies. I still do use carbon paper to keep track of what I wrote in conversations. I guess my point is that probably any and all brands can serve like that today. You can feel the paper in the store for that plastic feel; the carbon paper I have at hand is the older paper-feeling kind, thoigh I have used the plastic kind you describe. Can't say I noticed a difference.