CaseCrown Neoprene Sleeve Case (Vintage Sketch Trees) for Kobo Vox
While the item itself is lovely, I'm not sure that it's appropriate for the Kobo Vox.  I had to do some tugging and stretching to get the zipper closed.  Because of the nature of the fabric I do assume that the fit will get better over time, but I think that this case is probably better suited to a smaller ereader.