I have a 3 ring zipper binder. I have lots of rain checks but not enough sheets to hold them, I'm going to have to order these from online. Lots of coupons in various sizes. The only sleeves I have is the 6 card that's all I can find. I've even found a ten pack of the 6 card holders at the Dollar Tree, but that was after I purchased mine for .25 per sheet else where. Hopefully, it will morph beautifully in time. Yayyyyy Me!!!!!!!!!!