I'm able to report back on the
Timbuk2 sleeve that I purchased ahead of my reader. I am actually finding it to be nice. It's pretty slim and doesn't add a lot of bulk. It feels pretty substantial now that I have put the device inside. The inner fabric is soft, and I don't worry about scratches at all. It closes securely with three large Velcro closures, and I'm able to clip the stylus from the inside and the flap covers it, which seems to be very secure.
I think I am going to prefer using a case with my reader (always have cats jumping on my lap, making me fear that I will drop it one day), but if I didn't have concerns about that, this sleeve would make me very happy.
Even with the sleeve on the reader, I still think I'd hesitate to throw it into a backpack or something where it would get jostled or pressed on too hard. But I'm really treating it with kid gloves right now because I'm just so thrilled to have it and it's brand new. I use one of those mini messenger bags for my keys and cards and such, and it has a separate large pocket inside that is lightly padded. I have been fitting my T1 in the Timbuk2 sleeve into that large pocket for transport elsewhere if I have to carry a bunch of other crap.
Overall, the Timbuk2 sleeve looks very durable and very secure. And I love the color I chose. Price is right at $19 (on sale from $25).