Reddit reviews 6" Red Soft Neoprene Sleeve for Kindle 4, Touch 3G, Amazon Kindle 6" Wireless Reader, Samsung Galaxy Tab P1000, Sony PRS Digital Reader Pocket Edition, Universal eBook Reader with 6" Screen by King of Flash
We found 1 Reddit comments about 6" Red Soft Neoprene Sleeve for Kindle 4, Touch 3G, Amazon Kindle 6" Wireless Reader, Samsung Galaxy Tab P1000, Sony PRS Digital Reader Pocket Edition, Universal eBook Reader with 6" Screen by King of Flash. Here are the top ones, ranked by their Reddit score.
Excellent for any occasion, whether you are at working, in school or traveling.Smooth non-scratch interior linings throughout the bag.Provides maximum protection from dust, shocks, bumps, scrapes and scratches and other damaging agents.Can also be used as a stand-alone case or be placed in another bag to carry.For Comaptibility and size, see description.18 X 13cm
I imagine any of those neoprene sleeves for the Kindle would be an alright fit.
Such as https://www.amazon.co.uk/Red-Neoprene-Sleeve-Wireless-Universal/dp/B008MXQ67S/
The GPD Pocket is 18cm x 10.6cm, and these cases are 18cm x 13cm