I went to Chapters Indigo this morning and checked out their KT cases. My favorite would have to be this one with the elastic band closure and looks like a Moleskine notebook. The case is perfect - it's really nice and doesn't feel "cheap" like the other ones. I also like that it doesn't hold the KT with elastics.
A few of the other KT cases they have are smaller in size than this case, but they hold the KT with elastics and I didn't like the leather-like feel of them. They also have a few that are like the above case but are more expensive, don't have the elastic band closure and have fancy covers like a zebra print or a typewriter print.
I had a look as well at the sleeves - nothing too special about them and I was more interested at the cases. If there's a Chapters Indigo near you, go check them out. It's super helpful to feel the cases and see which one appeals to you the most!