I have my Rodent 9 in an RTAK II sheath, works great so I'm sure the 911 would fit also. The RTAK II sheath is a good 2-3 inches longer than need be though, but the outside pouch works great to hold a leatherman or other tools.

What I would really love to find is a TOPS Anaconda sheath, fits the Rodent 9 very well, not too much bigger like the RTAK is, and has 2 outside pouches to fit stuff in.