I did a forum search on this product but didn't get any hits; I apologize if it's already been posted.

I came across this water container while surfing around today. The thing that makes it a potential contender is that it folds flat, as opposed to a Platypus water carrier. I may try an Aqua Pouch to see how it works out. A key issue will be how secure that zip closure is.

This quote from the manufacturer makes me think they have a good perspective on the product:

"A little history is in order. I'm John McCann and the Founder and Managing Director of Survival Resources™. When I was in the US Marine Corps, we used non-lubricated condoms in our survival kits for carrying water. They were small and fit in even the smallest kit, but they had to be supported in a shirt sleeve or pants leg when full of water, or they would burst. I was always looking for something better and eventually found the Reynolds™ Oven Bag, which I featured in my book "Build the Perfect Survival Kit." It packed small, was robust, but had to be marked with a 1 liter line, and it didn't stand up by itself and was difficult to transport. I had many ideas and prerequisites for the ideal survival kit water container, but finally decided that I would just have to develop one myself. After many rejections, the AQUA-POUCH™ is the result of that endeavor. It is everything I have been looking for and hopefully you will think so also."