Hi Robert,
I have never warmed up to the "condom for water storage" idea (I have had a few break) so I use Whirl-Pak bags, and am happy with them. I am often required at work to secure liquid in these bags, when closed correctly they do not leak and withstand quite rough handling.
Doug did a test of these compaired to Gerber bags in the Equipped Briefs section of the main webpage found here
http://www.equipped.org/etsbriefings202.htm#condom_alternativesThe only difficulty I have found with Whirl-Paks is that they usually have to be purchased in bulk, where the Gerbers are found in small quanities at many stores.
Mike