I know I'm a bit late replying to this but I've been away...
I also prefer to use my Kobo without a cover and recently I bought a felt sleeve for my Aura One from these nice people:
http://stores.ebay.com.au/emmersongr...k-felt-sleeves
I heartily recommend them. They make the sleeves to order so you should be able to get one for your device. I took my KA1 travelling with me in this sleeve and it survived perfectly unscathed.