I have a Timbuk2 Kindle Touch Envelope Sleeve in Black/Gunmetal/Red:
http://http://www.timbuk2.com/tb2/pr...nvelope-sleeve, and it fits the PRS-T1 with almost no room to spare (although room for the stylus beside it). I think it provides suitable protection, although I don't know if it helps protect the screen from being broken. I would totally recommend it (especially as it is currently on sale)!