Inspired by this discussion and hunter's post, I did the same thing yesterday (bought and tested oven bags for holding water) with similarly positive results. Although I could only find the turkey-sized bags which are too large, and the seam was leaking on the sample I tested. I was able to create a new seam with my FoodSaver (run it through 2 sealing cycles as it takes more heat to melt this material). The new seam held well and I was able to make more convenient-sized bags, especially one sized about like a 1.5 liter Evian water bottle. I had good luck closing the top per billvann's procedure of spinning the bag, doubling it over and wrapping with a twist-tie. It really held water even up-side-down. One survived extended handling while full and even some moderate stabbing with a ball-point pen and I finally developed a pin-hole in another after dropping it in the bath-tub a couple times from about 2 feet high.<br><br>I would say that based on this limited experience that the oven bag has the potential to be practical, much more so than a condom, and it would be pretty compact when properly stored. You would still have to handle it with extreme care, obviously, when full of water if you expect it to last several days in a survival situation, but it is worlds ahead of a condom, which I don't think is worth even its negligible weight and size, based on my testing of them.<br><br>However, compared to a 1-gallon Ziplock freezer bag, it wasn't as durable, not nearly as convenient to open and close, and only a little more compact. In the end, I decided to stick with my Ziplock for now. I could see the oven bag being a good choice where the need to trim down a little more bulk is crucial and I may use one in the future for that reason.<br><br>On a side-note, while shopping for oven bags, I noticed a (new?) style of zip-lock bag that (according to the packaging) is pleated so that it will stand upright and stay open all by its self for easy filling, sort of like a bucket. That might be a convenient feature for survival use. It would allow unattended filling from a siphon or through a make-shift filter, or free up a hand when scooping water from a shallow source. I may look into testing some in the future. Anybody have any experience with these?<br><br>