Are you looking for a protection cover which easily fits in your purse or bag? (geckocovers.com)
I love that they conveniently fit in my purse for easy hiding until they are really needed! (gofreshbaby.com)
My e-reader fits in my purse even with the protective cover on, and that's why I bought it, so I could read on trips without carrying around heavy books. (dearauthor.com)