I had one when C*x sold them off cheap. I pulled that bladder out like you would a chicken gizzard then put put a Norvel with a tank mount on.
Didn't like it.
A little later they appeared on the Norvel line up as the U-Can-2.
SIG sells them now for the .074
http://www.sigmfg.com/cgi-bin/dpsmar...FV4.html?E+Sig

Edit... Went and dug the piece of do - dah out and added a pic