Country Comm's hydrant pouch will fit a 48ci 3000PSI and Palmer stab very nicely. I use mine on a Condor H-harness and battle belt. Adjust your shoulder straps high or low it feels very comfortable plus you'll have plenty of MOLLE for other things.
http://www.countycomm.com/hydrant.htm
http://www.countycomm.com/hydrant.htm
