Blytheking makes stuff and sells them at Etsy, the last line on the product blurb caught my eye,
"I made this case to fit the large size Moleskine notebook (5×8.25", 13×21 cm).
original design features security strap with button closure, and
back-strap, handy for hooking your pens onto, for tucking papers under,
and for securing case to your bag or body. Front pocket measures about
Made with vintage Pendleton wool fabric, and vintage button.*
*No new materials were purchased in the making of this product."
Just in time for Earth Day, yes?
Check them out