The printed color of the lid on the case carton was changed. I think it went from all blue to blue with a white side. I assumed that's because the paper product inside is being supplied to Staples by another manufacturer than the previous box. I now find that the paper is very curly after printing on a laserjet printer. I tried flipping the paper before printing and it does the same thing if not worse. Also the feel of the paper seems to be not as smooth as it use to be.
I don't think I have bought any other brand of paper aside from Staples' own. There are often rebate offers which makes the deal sweeter - watch for them!