Boy, I am just a posting fool this morning! Anyway, this seems interesting and merits a caution:
the Moleskin shell that Mimouille references above :http://store.moleskine.com/en/shell-small-2253.html#249=7 (The UK site) shows slightly different dimensions than the US site: http://shop.moleskine.com/en-us/bags-cases/shells-cases/shell-small-black. They are close, so it may be simply i.d. vs. o.d., but may be that they change the products for different markets, the pages sure as heck look different!
OK, I'll stop posting for a while now.
Thanks to everybody for making this a uselfu, cooperative, informative thread to read and participate in.
I bought mine in the shop in Shanghai, so I could test it first...