Fetish Zone "Cadejo" K9 Sheath w/Ball Sack
[FZ33120 Cadejo w/Ball Sack]

First, I must say I absolutely love this sheath! The only downside is that the sack is a bit small for me personally. It stretches a lot, but slips off. I'm sure anybody with a more reasonably sized sack will have no issue though. The knot is great and it feels wonderful as just a sleeve.