Please see my response in this thread:
Case is a bit long, but provides a very snug fit without any bunching on the ends. If you prefer an even more snug fit, you can try the black one with a velcro closure. As indicated in my other post, these (and the black velcro models) are on sale for 50% off, which brings the price down to $15. Bring your PRS-650 in its lighted case and try before you buy. The folks at the local Borders were very helpful in this regard.