I'm loving my new copics, but paper is a whole new thing to deal with when using markers. I first thought bristol board was going to be my new best friend, but it's not. At all. It bleeds like a maniac. Way more than I expected, or want, really. Maybe it's the bristol I'm using. It's old, (probably 10 years) Strathmore stuff, I think. I've never had too much of a problem with until now.
Anyway, I've decided to pursue other papers. My sketch book paper is better. It's really nice for quick sketching with copics. Fast stuff, messy, stuff. (The sketch books I use, by the way are these:
Essential Wire Bound Sketch books form Opus. They are very nice.)
I picked up some Letraset bleed proof marker paper a couple weeks ago. Holy Paper Batman! This stuff is nice. Doesn't bleed at all. Not even onto the next page, despite this stuff being very very thin. Which is another nice aspect: I can trace line art without a lightbox! It holds the color amazingly well. It's super smooth and bright white. 10 points!..... Until I took my microns onto it. And Koh-I-Nor pen. They smudge like the world is ending in 24 hours by a very large comet. *sigh* The only pen I have that doesn't smudge is my Copic Multiliner, but I only have size .005, which is ultra tiny lines. I like something with a little more substance. And I haven't had a chance to go buy more Multiliners. But would still feel bad because I have multitudes of microns that I don't know what to do with.
Which brings me to my last test subject: Card Stock. I had some scraps around from my test prints. This seems like the best bet so far. It takes both ink and markers well. No smudging and very little bleeding. Woo!
Anyways, enough of me rambling, here's a visual comparison:

I'm working on a set of Avatar: the Last Airbender bookmarks. This is the Ang one. First we have the card stock, very quickly scribbled (note the "head wtf?"). I colored the yellow with the wrong shade. opps. Middle is my sketchbook. You'll notice it's a little dirty looking in comparison. And last, the Letraset paper, and the glorious smudging.
I'd love feed back on this... on both the bookmark, my copic use and the papers. :)