I carry an oven bag and an empty 1L or 0.5L Platypus bag in my vest. I figure in an Urban setting I will be able to find empty bottles cans etc that would do. I also keep 2-5, 0.5L bottles of water at my desk. I grab my carry bag and at least one water bottle when the fire alarm rings or the building starts to rock .<br><br>There is Great Water Container Test and many other discussions on this forum that covers condoms, bags and whatnot. <br><br>I do not carry a condom as container, and have never tried to use one for water.