My take on making a gravity filter bag from a dry sack. Mostly it's about the selection of fittings and other hardware.
Fittings from U. S. Plastic Corp. http://www.usplastic.com/
#64654 1/4" NPT male quick-connect with shutoff $5.87
#62164 1/4" NPT threaded cap $0.47
#60464 1/4" hose barb female quick-connect straight thru $1.51
#60466 1/4" hose barb male quick-connect straight thru $0.85