That's all right, as I've just stopped using copy paper. I had a test of the Kozo I bought yesterday, and it's a miracle. I didn't really believe before I tried it, that it would be strong enough to hold my folds, but it works suprisingly well, even though it is semi-transparent and when you first feel it you think "this is going to rip on the first fold I make". But I tried it on Robert Lang's mouse/rat from origami zoo, which was a real problem for me when I folded it out of copy paper,due to layers, and but with Kozo, the finished model was half the width of my original so it's ten times easier to make a model with such layers. So here it is, in all its newfound glory, folded out of a 21X21cm square of kozo, which I think is 25gsm.
Note that is not as good as it might be, as I'm still adjusting to this paper, being not used to it, as having never folded with it before, so it's probably going to be a bit of time before I can get the full potential out of this paper(and some MC/wheat starch).