I prefer freezer bags. The bags have several advantages over condoms. They are designed to hold food and they can take higher storage temperatures without deterioration.<br>I also recommend rolling the bag from the bottom. If the outer layer of the roll suffers damage, you usually keep a large portion that can hold water. When you fold it, the bag might leak on the creases and the bottom part can be damaged due to abrasion or sharp edges. <br>I don´t bother using condoms for water storage. They need almost as much space as the plastic bag and they can´t be used for collecting other things.