I use it with 67# cover stock. Since its the same size and the regular paper I just swap out the regular paper. Whenever you open one of the trays it asks you what kind of paper is going in so it knows which one to get. I just leave #10 envelopes in the multi-purpose tray. If I wanted to have both normal and card stock loaded I'd put the card stock in the top tray and set it in the window that opens when you close the tray.